Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8e7e5a1bf8875e…

MALICIOUS

PDF

76.6 KB Created: 2021-05-07 21:41:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 8902891c0422577f485c7e9a23090e04 SHA-1: 4779e8c586793987122a7774d6412c87929bddde SHA-256: 4e8e7e5a1bf8875ef37bf3cf3470a986ff07254c851cf734914c841b9abd3050
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or traffic-driving campaign.

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://jottigo.ru/strik?utm_term=volume+formula+for+right+angled+triangular+prism PDF link annotation
    • http://promooffer.site/loxegikerarevekitufof5igi.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/91885112009.pdfIn PDF document text
    • http://goproits.com/what_happens_in_the_last_book_allegiant9jk0o.pdfIn PDF document text
    • https://sanorasawuvut.weebly.com/uploads/1/3/0/7/130738762/7697cc32420c.pdfIn PDF document text
    • http://nanolenka.xyz/69991346256i2vr1.pdfIn PDF document text
    • https://boliwarabinobe.weebly.com/uploads/1/3/1/4/131437394/kilawog.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/vobamojevaw.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/volifijaxeladuwo.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/5648870041.pdfIn PDF document text
    • http://deflecfcvy.best/23945945254s4ik.pdfIn PDF document text
    • http://pearhaidhr.fun/carrier_weathermaker_8000_blower_motor_replacementmr4yi.pdfIn PDF document text
    • https://belexikezetuvom.weebly.com/uploads/1/3/0/7/130775063/370397.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_2225a38f51814cfebdc0939380350472.pdf?index=trueIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_b5eb1bd21e8741749971c11c15bec3ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/18edaee7-4bfb-412d-b0a1-77ef5a5e3bf7/88527968664.pdfIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_cd7279677935411d893437748411456a.pdf?index=trueIn PDF document text
    • http://pilejifizodan.onlinewebshop.net/6070746235.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_724b91867b614bac9be66c311bf74270.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/526f4cf1-9465-475e-bb70-3b5bee44c743/metal_gear_solid_1_remastered_ps4.pdfIn PDF document text
    • http://filosoko.onlinewebshop.net/jeppesen_instrument_commercial_manual_free_download.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_bedd463a26774f53a93bc3d04bd9bd5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa3ce5d1-c055-46ce-a9c6-c169238ad5df/19284236073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/810604ab-f0c1-42fd-84bf-d2a24c4ce31e/lokutetolepufob.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_off0000eb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 5420 bytes
SHA-256: 75ec4846a5d7e7fbe5ba3aab566f55ecf7cf4c511fd69da269cbf23cf6b4dcfd
font_01_sfnt_off0000fdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 11436 bytes
SHA-256: 5092e62a3a4d49d7ec2ee6c38308830c826dbf5db62869bd2afc1a0a9787fa85