Malicious PDF — malware analysis report

Static analysis result for SHA-256 e38168c0d7402f9c…

MALICIOUS

PDF

78.9 KB Created: 2021-04-08 00:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5b87181d9d40b567ae697878fd7c1d76 SHA-1: 99e9770b95641b20a2e543d32c04e265199de1c1 SHA-256: e38168c0d7402f9cb44725709ab4de5bea615e52cf35e4f5d7aed8b2a743d065
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, and one prominent URL suggesting a search for pirated software. This indicates a likely phishing or malware distribution attempt, leveraging a link farm to obscure the malicious intent. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/wix?keyword=where%2527s+my+water+full+version+apkpure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369336/normal_602fd2dc0217c.pdfIn PDF document text
    • http://fodamibokaf.66ghz.com/diploma_electrical_engineering_syllabus_west_bengal.pdfIn PDF document text
    • https://kadogejajufa.weebly.com/uploads/1/3/4/7/134717900/41b2a13c7f320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447647/normal_604d63f7a4957.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448539/normal_5fe30b219f52f.pdfIn PDF document text
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/dazuzobiva.pdfIn PDF document text
    • https://logutidukikov.weebly.com/uploads/1/3/1/3/131380383/6d8fbdc3c03d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377377/normal_5fcefed6e152d.pdfIn PDF document text
    • http://kulofokugizadeb.22web.org/greenworks_2000_psi_pressure_washer_stopped_working.pdfIn PDF document text
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/fomazi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2521c3e2-5736-45bb-9381-71005f2ffa37.filesusr.com/ugd/c85705_e09e6897802f40eda9bb24ab4f9e4700.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/davulojotiwogelizado.pdfIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_76606aed05d1498c86e18636586efa0f.pdf?index=trueIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_eccae1e16cf342a8bc62717ae86befe4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/lisasolusanosefawig.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_f51ca512cad44f829bfdbc0ef851189e.pdf?index=trueIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_cc340f32d1974f1992f26ca393a5e9f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesixefe/christmas_jazz_fake_book.pdfIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_da63c92920684f83b44eabfca368c865.pdf?index=trueIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_6896aadf33cc4beb9b9bc70183eec3ba.pdf?index=trueIn PDF document text
    • http://lopogoroje.rf.gd/kibopekilepepapizibu.pdfIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_fbf71e047a2d4e04a7cade8d3f132648.pdf?index=trueIn 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_off0000f366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 5504 bytes
SHA-256: 324d0edfa09a5209f59f05cc5b253fcb42c815c59ad6eebd38aa43f37d465a29
font_01_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 11212 bytes
SHA-256: 97ea50aa60bf86d28e22e762d1a624451f2a1b54bf4e667469a158f5df9df7a1