Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c5d1e6e1d53958…

MALICIOUS

PDF

104.7 KB Created: 2021-02-16 23:07:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 27fb6712e6b0b0347dd643e7fb9765d8 SHA-1: 95a1487b78972a0e002dd47bff3169c0ad0f7896 SHA-256: 64c5d1e6e1d539588044570fd51a63a7cc920affe29ebf67fc6612b01276aae3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains or link farms, suggesting a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/123?utm_term=how+long+does+it+take+to+shutdown+a+nuclear+power+plant PDF link annotation
    • https://korexabareruwa.weebly.com/uploads/1/3/2/6/132680962/5700818.pdfIn PDF document text
    • http://tixshopclub.fun/bowipusepupusn07el.pdfIn PDF document text
    • https://cdn.sqhk.co/kamupudoro/jjgflia/80625587996.pdfIn PDF document text
    • https://cdn.sqhk.co/supuzeren/ahjhPja/foguw.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluwumenad/dZyicjd/induction_cooking_heater_in_pakistan.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/HAyVha3/carrot_cake_recipe_easy_simple.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/fupifubixoveseru.pdfIn PDF document text
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/0de130.pdfIn PDF document text
    • https://rejurikin.weebly.com/uploads/1/3/1/0/131070637/5274095.pdfIn PDF document text
    • https://varepanuror.weebly.com/uploads/1/3/5/3/135394497/5504744.pdfIn PDF document text
    • https://kitigenuripoduj.weebly.com/uploads/1/3/1/0/131070171/365b09a1e18b.pdfIn PDF document text
    • http://rerubin.space/36919923215s8zls.pdfIn PDF document text
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/givazix-semamogego-dixaru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tumasun/best_compact_android_phones_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/kendrick_lamar_adhd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/side_navigation_menu_android.pdfIn PDF document text
    • http://zezazemana.epizy.com/flatpak_user_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14868 5336 bytes
SHA-256: 541515692a6c21feb048d5db30f36778d60d03e560a3aaf131ac8040b44f51b0
font_01_sfnt_off00015a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A91 13940 bytes
SHA-256: fd9c416154904d5a5dcf397d5b90bebf87314978fd054a5bdfb9cefd5c2db445
font_02_sfnt_off00018701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18701 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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