Malicious PDF — malware analysis report

Static analysis result for SHA-256 4847de3bacd547ae…

MALICIOUS

PDF

76.3 KB Created: 2021-03-10 21:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f9d8f46f2523b6e20c2e376c992b48cd SHA-1: 3a91271305230d2daacbf455b7e4d59fc1ec6e8e SHA-256: 4847de3bacd547aebdcbac2e002174f813f4ea8790752d172b73d9fa132e3d16
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=explosion+sound+effects+free PDF link annotation
    • http://nurokojo.mypressonline.com/wedogadibilokoduwirinop.pdfIn PDF document text
    • https://tivubolo.weebly.com/uploads/1/3/1/8/131857038/vatepezexo_buvujuleganuv_kileruvipinosu.pdfIn PDF document text
    • http://telovajov.medianewsonline.com/benudivolugi.pdfIn PDF document text
    • https://kodetinerimaguw.weebly.com/uploads/1/3/5/3/135347088/fbc8a88db9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490376/normal_5febd4b95f213.pdfIn PDF document text
    • https://luxoxika.weebly.com/uploads/1/3/4/8/134899107/3577034.pdfIn PDF document text
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/6734170.pdfIn PDF document text
    • https://vugifalufaduzo.weebly.com/uploads/1/3/4/8/134889855/turanezifava.pdfIn PDF document text
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/8636554.pdfIn PDF document text
    • https://worojipe.weebly.com/uploads/1/3/1/3/131382243/sopojijaxakiwebidor.pdfIn PDF document text
    • https://vurejubi.weebly.com/uploads/1/3/1/4/131454114/miraliv-renew-ropez.pdfIn PDF document text
    • http://shtancircul.site/77884438248pvvt5.pdfIn PDF document text
    • http://jarevine.mywebcommunity.org/vusemifowuzor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_603c4c2c8ac6c.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/was_it_a_dream_full_story.pdfIn PDF document text
    • http://cafechorsu.ru/renonatuxuvigakosanjn32s.pdfIn PDF document text
    • http://libralab.digital/getty_images_pricing_ukjty7r.pdfIn PDF document text
    • http://ejinaya.com/jekipejopedu9s79.pdfIn PDF document text
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/1fd586c1bf594.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://geforagegi.atwebpages.com/17589840782.pdfIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_df787677f07f4b3cbee4dc4f3d70e7c3.pdf?index=trueIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_4d25f79c7a4f4a2cb18874577f80cf19.pdf?index=trueIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_99c0804c954e4d58a345629485caf6e1.pdf?index=trueIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_7ca6747886f449fba995e51d391733cd.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_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 4964 bytes
SHA-256: 97fe25530c396cbbcc049b5dd9d07372053a4a1784e13a2f78566e2e14aa8966
font_01_sfnt_off00010019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 10532 bytes
SHA-256: ac90a8dd1fb20fb32147d29c3506eb2a43577ee6481025297b0947e1c496d51a