Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2778efdc24900c…

MALICIOUS

PDF

74.7 KB Created: 2021-01-21 03:59:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: af61afe2cfae582584154665c116f321 SHA-1: bae9963ef8931e7ddf0937744b0167b6f71e3e47 SHA-256: 7a2778efdc24900c16a0c024b9d5287c33627888c12b4709087eab41e9d8f4a5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and exhibiting link farm characteristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffset.ru/123?utm_term=world+war+one+trench+warfare+worksheets PDF link annotation
    • https://cdn.sqhk.co/pirujezexod/hbhdEgc/online_slots_free_welcome_bonus_no_deposit.pdfIn PDF document text
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/b60299195182e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5fa3174b33466.pdfIn PDF document text
    • https://xatuzagu.weebly.com/uploads/1/3/0/7/130738971/xovuv.pdfIn PDF document text
    • https://lunafegosewexik.weebly.com/uploads/1/3/5/3/135351611/8216710.pdfIn PDF document text
    • https://cdn.sqhk.co/fakomuse/hjosrmD/taptap_heroes_gift_codes_september_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369638/normal_5fef1ab952bab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5fcea6e0c0616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465015/normal_5fd2733670743.pdfIn PDF document text
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/9496242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469850/normal_5fe980fd3cf87.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/hijuhgZ/zufubekofazafuwo.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
    • http://fufezexu.epizy.com/debtor_days_report_sage_50.pdfIn PDF document text
    • http://birotizedu.epizy.com/benazepril_dosage_forms.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_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 5016 bytes
SHA-256: f59aba9fdca06f61b8d19fc5a7da22855e2e96dc946e9318d3851b124e94f847
font_01_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 10344 bytes
SHA-256: 7eb622f2854db3b7049301617f8563f88626fe8bc8febe52042b2cae22e19852
font_02_sfnt_off00010ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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