Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b00cabbbec5f6bf…

MALICIOUS

PDF

77.2 KB Created: 2021-05-29 11:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 27d10d72db0b9609e5ea5cb26fbcdc84 SHA-1: 4bd3341d67e1f818a9d87c6c8c4c33cb58b09fe6 SHA-256: 8b00cabbbec5f6bfaffa99b2275deefa7c1f22edc21dd47dc0c3e6ab17a6addc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services like Weebly, and is flagged as a link farm. The document body, though heavily obfuscated, contains keywords related to 'asexual reproduction' and 'marathi', suggesting a lure to attract users to these external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/123?utm_term=asexual+reproduction+information+in+marathi PDF link annotation
    • https://saselafe.weebly.com/uploads/1/3/4/8/134894966/dubokavefekabi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403282/normal_5ff1051b5c9e5.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/fitoduvawon_vemabavi_jedur_fidakajozupov.pdfIn PDF document text
    • https://fogipomovilop.weebly.com/uploads/1/3/4/0/134018275/kidafaromirujavap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_6009d075e6c78.pdfIn PDF document text
    • https://logosomuzabi.weebly.com/uploads/1/3/0/9/130969340/gusugenen.pdfIn PDF document text
    • https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/04fcfe00d5ab115.pdfIn PDF document text
    • https://morizuni.weebly.com/uploads/1/3/4/6/134606759/1206608.pdfIn PDF document text
    • https://kajukijuxuvame.weebly.com/uploads/1/3/5/3/135329863/belafotuliga_damarobiket.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452400/normal_60403b605e4f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408712/normal_602ad200be07d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403820/normal_5ff120dcd3e06.pdfIn PDF document text
    • https://fibimijisu.weebly.com/uploads/1/3/4/4/134461798/luvironugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_6069263ced1da.pdfIn PDF document text
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/nujusuzu.pdfIn PDF document text
    • https://pelunukemuf.weebly.com/uploads/1/3/0/7/130776607/roxafijapovegus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375909/normal_6061de8880f83.pdfIn PDF document text
    • https://jetufebarivoma.weebly.com/uploads/1/3/4/7/134703916/2506043.pdfIn PDF document text
    • https://fujulisu.weebly.com/uploads/1/3/4/0/134042697/6115968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414342/normal_5fd2706863255.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/d52675ff-d34c-4f18-9f17-743691a2540c/highest_possible_credit_score_range.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0daf74b-a4a5-48a0-a35d-50d9e3b5dd2b/everything_i_never_told_you_free_online_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4867cc0b-e2d1-41ad-8744-c3b0bd640828/vugevoretotewobedixezoja.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_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 5452 bytes
SHA-256: 8f98b6f5a233083e49e2609e2c39992424c59beacfe7d953d63455563ee50b12
font_01_sfnt_off000103f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 10308 bytes
SHA-256: 72b05279e54978994b27fdeb12366fe8ae79811e2a66e28a2284ee18cb5d44b2