Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4c90aa940e93fc…

MALICIOUS

PDF

72.6 KB Created: 2021-02-28 13:23:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 22c30234040c59c58a59104932051323 SHA-1: e309df626c0bd62df8f52578cfc3f2ab4553459f SHA-256: ea4c90aa940e93fcfcb5d3b1dd1bd2fb462cd789adc2ec7a1480c720117daceb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs point to various PDF files, suggesting a multi-stage redirection or content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=verbos+irregulares+en+ingles+presente+pasado+y+presente+perfecto PDF link annotation
    • https://gikowotezura.weebly.com/uploads/1/3/4/4/134493608/seturevoliweneperuk.pdfIn PDF document text
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/ec7ff30d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366401/normal_6030687bba8be.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/giicscp/grand_piano_for_child.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/0hj4fsl/big_bang_theory_penny_last_name_2015.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485930/normal_5fcc1f25a96ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_5fe80df2974de.pdfIn PDF document text
    • https://didefitelov.weebly.com/uploads/1/3/0/8/130874246/bikejugajotafun_vabudiv.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/hvGUXjc/4_colour_cube_puzzle_solution.pdfIn PDF document text
    • https://cdn.sqhk.co/xeviremal/ijChjhe/tokunufokemosojezovuled.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/Djcjh3J/cashkaro_highest_cashback_best_coupons.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_5fd894d6a169f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417998/normal_5fcbe4891cb46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427499/normal_5fc8368957d93.pdfIn PDF document text
    • https://cdn.sqhk.co/lekabadixi/igzgjji/rozinapigebewukodoxivujib.pdfIn PDF document text
    • https://tezefidusipenu.weebly.com/uploads/1/3/1/8/131857758/1593947.pdfIn PDF document text
    • https://cdn.sqhk.co/zonigita/ghbjj2U/coloring_pages_bendy_and_the_ink_machine.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/chambers_student_guide_slaughter_and_may.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/brainy_baby_dvd_free.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_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 5528 bytes
SHA-256: 4835e86d424a566c5c60ee40df4084fc93a384693fca9d00c89f565b68b9b25c
font_01_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 11468 bytes
SHA-256: 09508ac20b8bec51cdbb19559f74c8edc757328505802600ad9089cd972d101e

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