Malicious PDF — malware analysis report

Static analysis result for SHA-256 7127820fd84c8bf7…

MALICIOUS

PDF

75.3 KB Created: 2021-04-19 03:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 2ad4715c28aab604957ab61de76858d6 SHA-1: 8b0075b8617d5663b315a468ed28df4fa948bb3d SHA-256: 7127820fd84c8bf780478a69e3f3e5c0c7bb9033f262fc78e7dd534e0632f544
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm or SEO manipulation scheme. The primary URL, 'https://zajinet.ru/strik?utm_term=psycho+original+book+cover', is likely the intended destination for users, possibly leading to a phishing page or further malware. No scripts were extracted, but the PDF structure itself is designed to redirect users.

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://zajinet.ru/strik?utm_term=psycho+original+book+cover PDF link annotation
    • https://cdn.sqhk.co/wuwoxegolewa/iewibcc/cbse_class_8.pdfIn PDF document text
    • https://cdn.sqhk.co/nokowifupe/3jdgfjh/dusoronilaxamirugedomix.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/alexander_the_great_empire_map.pdfIn PDF document text
    • https://cdn.sqhk.co/gutejalajige/g0M4h95/jubajobakasukelebegegavi.pdfIn PDF document text
    • http://xifadezuzurap.medianewsonline.com/33312767605.pdfIn PDF document text
    • http://ditoterelutas.sportsontheweb.net/55972154370.pdfIn PDF document text
    • http://tilosag.mypressonline.com/54079300192.pdfIn PDF document text
    • http://buputenajonix.mywebcommunity.org/kotefodinoxuduvalanupil.pdfIn PDF document text
    • https://cdn.sqhk.co/xusezasaj/VYOh6ji/seiren_batch_google_drive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xekazaz.myartsonline.com/ravatofisoxopiti.pdfIn PDF document text
    • http://mubodadekutaxim.atwebpages.com/banivajajax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3caf6908-2188-4081-8e39-cc58a4826a25/how_to_sync_skullcandy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b835feee-e57d-4e3e-876b-58477abd3186/mugasebiwisoj.pdfIn PDF document text
    • https://63a0a607-6d1b-4b95-a813-f1b07cabc719.filesusr.com/ugd/ad56f2_bfd2f8dfedb940f3aed6fca8073d791c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9749dec9-56ba-4554-876f-b74ae2558f8c/ratazelasakagarusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/430fe3cd-56a5-4b0f-ab23-6c4bafcdbd8a/toyota_camry_hybrid_repair_manual_2007.pdf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ef23e4-fcc8-4c4a-9f03-13f7a1293687/xexogonakuzevusuwixapuli.pdfIn PDF document text
    • http://rafazusasune.rf.gd/clases_de_guitarra_acustica_para_principiantes.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_81d2ebc7158b4f95a97a24c2303d1cee.pdf?index=trueIn PDF document text
    • http://dipulitexaxuz.epizy.com/broken_angel_lyrics_video.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_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 5428 bytes
SHA-256: d429e93fa863bc70c5703d99821e8e495fd2f0e999ccc132b796653afb5c957d
font_01_sfnt_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 10624 bytes
SHA-256: 88363c32c3bd4602c0c5df86b766c01163db20eb55509edf99fe9babe81573e6