Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8ab8a26388d876…

MALICIOUS

PDF

78.0 KB Created: 2021-03-10 22:57:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 246c6bbdff8e50da68bdda14c473dfcc SHA-1: d08f4ea8d232a26a6989df73b4c916cc259b3890 SHA-256: 3e8ab8a26388d876740f5ba834edcf73cabcf86a262f17666f7fc666cb2c298f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, and the document body was heavily obfuscated, preventing a more detailed analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=shark+rotator+professional+lift+away+clean+filter PDF link annotation
    • http://smartroom.pro/sword_art_online_volume_1_aincraddxw1x.pdfIn PDF document text
    • https://tavurusifuta.weebly.com/uploads/1/3/0/7/130740255/556755.pdfIn PDF document text
    • http://com-connexion.xyz/strong_spas_embark_seriespxvrb.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/roblox_games_that_get_you_free_robuxbo1jd.pdfIn PDF document text
    • http://xenejesujotolud.mypressonline.com/how_to_fix_an_ice_maker_on_a_whirlpool_refrigerator.pdfIn PDF document text
    • http://reduslim-shop.website/55313760684n1ik.pdfIn PDF document text
    • http://italywow.info/what_means_gross_national_income_per_capita0k7d0.pdfIn PDF document text
    • https://papadapogapov.weebly.com/uploads/1/3/4/7/134706375/bukedivopojagi_dujig.pdfIn PDF document text
    • http://zusiwibewire.mypressonline.com/34727714878.pdfIn PDF document text
    • https://lelamibi.weebly.com/uploads/1/3/0/7/130738841/2c5abf9c59.pdfIn PDF document text
    • https://kabudinikibe.weebly.com/uploads/1/3/4/7/134716255/gabidi.pdfIn PDF document text
    • https://dofikusoru.weebly.com/uploads/1/3/4/4/134472045/299ff21e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95c0a34-31c8-4b87-9c4b-c5b106807f26/77854439352.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b5808cc-a483-4f6b-9454-87a5540df049/fovupobom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b4819a0-8909-4268-bf46-b1f01385e315/45121605492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7da3f1-d6b3-4042-913a-0c390dbc9cdc/49440680946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a3b3e9-35e9-4ac5-9fb4-a913168e4c30/how_to_calculate_simple_and_compound_interest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d35b234e-0feb-460e-a91c-c7ec6922f9b0/jafunomijabunewijelakoxo.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04F 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off0000f134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF134 5464 bytes
SHA-256: 0da97caa5f2fa3e3083c6ee430f3fb6bacb6d152a420ce4aeea45944d53701be
font_02_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 10896 bytes
SHA-256: b247e3549cfc8cbc600e6ba648fb08ba9bf3d09f1b1ce4d3299ccfe784e12f20