Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfbea64f9f172d7…

MALICIOUS

PDF

74.3 KB Created: 2021-02-18 08:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 257d08d25912a676d6dabe1707156d81 SHA-1: 770b949a12c464e462b98c693723c82b27bcc505 SHA-256: 8dfbea64f9f172d7d0bad22775acb534b46a6f0eb29ee0601926765ae8855e21
224 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector related to a firmware update lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting a malicious intent. The presence of a password-protected archive lure suggests an attempt to bypass security controls by encrypting a payload.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://crophysi.ru/strik?utm_term=icamera+1000+firmware+update In PDF document text
    • https://tunajixawovu.weebly.com/uploads/1/3/0/8/130873758/0a782bebd.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/4jjgjEV/gitoko.pdfIn PDF document text
    • http://remastacer.com/cash_gift_to_family_member_tax_deductible5f65i.pdfIn PDF document text
    • http://trenolgia.buzz/abandoned_farmhouse_poem_worksheet_answer_keyls2a5.pdfIn PDF document text
    • http://tramlaweq.online/3863510744876xjb.pdfIn PDF document text
    • http://gufutaca6.xyz/641368082937uuy6.pdfIn PDF document text
    • http://galoomer.online/34441358909tges3.pdfIn PDF document text
    • http://dontbeshy.xyz/limogosaridisuzojojerax4xao.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/74016778953s85t1.pdfIn PDF document text
    • http://tehnikator.ru/akbar_mughal_empire_informationpyfm0.pdfIn PDF document text
    • http://gufutaca1.xyz/80_day_obsession_challenge_packh3ad7.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/zulovugu.pdfIn PDF document text
    • http://hangzhoumetal.ru/chrissy_costanza_imagesbs8ew.pdfIn PDF document text
    • http://shlifovka-pol.website/tasco_48t_telescope_manualeh3ci.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 5316 bytes
SHA-256: dbd32bebfcb479f9ea73416523f1233d68d905f68929518f03fbffee0037374e
font_01_sfnt_off0000f6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D3 11320 bytes
SHA-256: 39e8daed36e8dc8a8876f39efdb8491518538ca28e9dcf5be46de8b2171aef05

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