Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f3b09b910c52a0…

MALICIOUS

PDF

109.7 KB Created: 2021-04-09 19:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7cbc991132db51245fdf5a510dfcbe0e SHA-1: 564ded659071ffbbb4b689ba2f050eb7779b8443 SHA-256: 78f3b09b910c52a0a8f188e2235d27a81585916afb6e11dbe4613d6bcf1857e6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The embedded text and URLs indicate a lure for downloading a handbook, which is likely a pretext for distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/strik?utm_term=ashrae+handbook+2020+pdf+free+download PDF link annotation
    • https://nanotobu.weebly.com/uploads/1/3/4/6/134638189/wimosesusemawumepi.pdfIn PDF document text
    • http://netzamka.ru/30922941679ulhhr.pdfIn PDF document text
    • http://novuvomedo.iblogger.org/4150390762.pdfIn PDF document text
    • http://rivugijunamusi.mygamesonline.org/wodix.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/c4d64cb1f1a324.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/bcs_preparation_book_download.pdfIn PDF document text
    • http://zixosoliga.iblogger.org/is_there_a_dark_tower_tv_series.pdfIn PDF document text
    • http://philonio.online/from_third_world_to_first_singapore_and_the_asian_economic_boomuw3e8.pdfIn PDF document text
    • https://putuxukive.weebly.com/uploads/1/3/1/3/131379249/5377707.pdfIn PDF document text
    • http://vinnipoh.fun/mercado_bursatil_definicion1vw6r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gotenekopibijo.epizy.com/gudozozawunifo.pdfIn PDF document text
    • http://jowokepo.atwebpages.com/batho_pele_principles_explained.pdfIn PDF document text
    • http://xuwomotibinifen.rf.gd/main_purpose_for_writing_the_declaration_of_independence.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/53137725349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7415f74b-359f-4868-9bc7-12367363b6ea/wishful_drinking_film.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/219c7376-b202-46d9-a28e-a22e875845f3/37189617458.pdfIn PDF document text
    • http://daruwenu.rf.gd/duvodudinizonixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d266da-547a-4f52-ae07-b0592a947511/66161124291.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/kidde_smoke_alarm_i12060_home_depot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8bd1e68-3678-4e82-ae48-027cede36668/dawokenozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f32a593-8ebe-4f9d-a0db-778c72938159/how_the_grinch_stole_christmas_full_movie_cartoon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/783665a7-b53e-4a18-acc1-48611e5c3ebd/2004_chrysler_pacifica_battery_drain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d26b297-5ff7-48f4-9231-aca89b5191bb/33722229961.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F2 6572 bytes
SHA-256: f8e893f13397ed75554267b457e1c702cb9f6c9e901bcb4de68b77b25b49230c
font_01_sfnt_off00012a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A13 3484 bytes
SHA-256: ad7f699f75a7be94771d29e0be6368c7136c1858a7c9c61ad13abab975ce6d12
font_02_sfnt_off0001368b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368B 5688 bytes
SHA-256: b8a5231afd35a5383c381de220391653a28781304580fe480306e1da81def62d
font_03_sfnt_off000149e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E8 17048 bytes
SHA-256: 7c0b7f7f110ce0978dea131f17be00a9e87b5a953e17c8a06dbef120d5bbf29b
font_04_sfnt_off0001802f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1802F 16604 bytes
SHA-256: 3189ebb32beeb805d3819c4a59452b360105d6b389ac132524fddb99255a1845
font_05_sfnt_off000196f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196F4 6064 bytes
SHA-256: b2bdf66ca980107e448388a8139f23d04f8038f6fc2436739650046121c4fb3d

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