Malicious PDF — malware analysis report

Static analysis result for SHA-256 811e93b41b734a62…

MALICIOUS

PDF

78.2 KB Created: 2021-04-04 01:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7b1e2dd836efb3c0f1e1da43726d7ed9 SHA-1: caa2e407b6e33735d6447d513261f0386378e4a1 SHA-256: 811e93b41b734a623a2744adc0a139d1fef775c6ab53d2f0fff61ff9b55e5ebc
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the heuristic firings, particularly PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, indicate a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=what+do+you+need+to+get+a+real+id+arkansas PDF link annotation
    • https://wilivaja.weebly.com/uploads/1/3/2/6/132682565/9e7167.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386613/normal_5fcdf577c917f.pdfIn PDF document text
    • https://pifujikis.weebly.com/uploads/1/3/4/8/134875168/sesuxeteriluni.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485156/normal_5feb3983e3b88.pdfIn PDF document text
    • https://najoxoveg.weebly.com/uploads/1/3/4/6/134677255/gapidonexove-sivixer-kojomor-sozanivevosaj.pdfIn PDF document text
    • https://vusuvokitajize.weebly.com/uploads/1/3/0/8/130874031/533211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460446/normal_601c8d5d444e0.pdfIn PDF document text
    • https://nimuneroz.weebly.com/uploads/1/3/1/4/131407882/83cb4339c3fa.pdfIn PDF document text
    • https://biruvosuvibu.weebly.com/uploads/1/3/0/7/130739381/8448754.pdfIn PDF document text
    • http://selolatoxomida.22web.org/xavasuxasililewe.pdfIn PDF document text
    • https://xalekosud.weebly.com/uploads/1/3/5/3/135350534/gipotixiworivef.pdfIn PDF document text
    • https://vinixojaz.weebly.com/uploads/1/3/5/3/135312356/tudage.pdfIn PDF document text
    • https://bafizotadax.weebly.com/uploads/1/3/4/7/134761596/rokogifoxageb.pdfIn PDF document text
    • https://fefumuvujudadi.weebly.com/uploads/1/3/1/6/131606087/9638204.pdfIn PDF document text
    • http://mamunetosi.iblogger.org/master_forge_smokers_website.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesakopibovadob.rf.gd/27772392525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/801035b0-d824-42ce-9f8f-2cf2fa67a73f/temalapidukadejuxakuribof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17acc57a-02a8-4e6d-b347-b2db4ae25d18/desowajakufojoru.pdfIn PDF document text
    • http://nupowabel.rf.gd/nibipagej.pdfIn PDF document text
    • http://kutifakibidi.rf.gd/bangla_comedy_wallpaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e343ec2-7243-4a1d-a76e-0ae3fffeee9e/the_magicians_cast_season_5_episode_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53142320-c35e-4291-a85c-7ceaea833112/how_to_change_to_radians_on_casio_fx-115es_plus.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A9 5264 bytes
SHA-256: c842c7b1333d0b05f1a90a88e2ad977ae03907397db4a9424d483dd68dab8cfe
font_01_sfnt_off0001069f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069F 10968 bytes
SHA-256: 138e818f9c448893a72738f710dbe5cfed53f3a40c0c188f36ef00cad7589db9