Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da78f05232b4276…

MALICIOUS

PDF

77.5 KB Created: 2021-03-29 03:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b24e978d511f485cc18393ea31662efa SHA-1: 56be183f881a3f8ad4c27eca6707d3a688456f99 SHA-256: 7da78f05232b4276f297edd25deea55e1205d6d826249010d1bc6b342bbad7bf
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 0.9999

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://seumenha.ru/strik?utm_term=how+to+learn+english+with+app PDF link annotation
    • http://navalny.design/concepto_de_balances_de_materia_y_energiab1wtq.pdfIn PDF document text
    • http://senteber.site/par_quoi_peut_on_remplacer_le_beurre_dans_des_biscuits1cvlt.pdfIn PDF document text
    • http://kufigada.22web.org/4688421229.pdfIn PDF document text
    • http://luxumelo.iblogger.org/64093490635.pdfIn PDF document text
    • http://prazdnikprosto.ru/ascites_in_catsypekm.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirorip/grigOu8/thl_road_trip.pdfIn PDF document text
    • https://fexiragija.weebly.com/uploads/1/3/1/4/131409693/xeraximodiguzuw.pdfIn PDF document text
    • http://somuvopavu.iblogger.org/what_does_trane_warranty_cover.pdfIn PDF document text
    • http://dinodosum.iblogger.org/nuwinorigobiloxenowegepus.pdfIn PDF document text
    • https://watagejikifawup.weebly.com/uploads/1/3/4/5/134589749/d5eb6d6fb.pdfIn PDF document text
    • https://cdn.sqhk.co/mizenopujoli/3gjlzCY/sololearn_for_laptop.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/iUzifjq/twice_kpop_songs_offline_app.pdfIn PDF document text
    • http://ericksandoval.com/how_much_do_refrigeration_mechanics_makeflr3a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_1c3680ff6fa1455080dd9248d0b6c5ef.pdf?index=trueIn PDF document text
    • https://09d56968-2ae9-412d-ad86-e67dc63a1c23.filesusr.com/ugd/e8b91f_5f5c14a9dad2466886c5429750d963e6.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_ac695e80c1b04fe09abc4870db0288a8.pdf?index=trueIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_89ad62d3d7134b248d0f06480b481917.pdf?index=trueIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_8c94155e5466434c86c1b8b7b111160c.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_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 5136 bytes
SHA-256: 1df45018f5fdb05fc9f35fe8290a975ba8af45127b921bcc63c47cf9fed7b52e
font_01_sfnt_off00010591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10591 9860 bytes
SHA-256: 6068b0adb6247b726ff879f0602eeb4bdd17a7377135dcd9f407b0dc56852b84

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