Malicious PDF — malware analysis report

Static analysis result for SHA-256 955453277ac32c99…

MALICIOUS

PDF

82.7 KB Created: 2021-03-03 15:16:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3fd7cbe664cf02e1bbcbceb0b0b6b70c SHA-1: bfa583290737a984f2a4574717e0cb3c16b3bc16 SHA-256: 955453277ac32c992b7733a07f3e8ca5d6839170112d2f9bec7b5ba3c019d3fd
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The document body, though heavily obfuscated, contains references to product names and technical terms, possibly as a lure. The presence of external URIs and the link farm structure strongly suggest an attempt to redirect users to potentially malicious websites.

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://lozipotod.ru/123?utm_term=frigidaire+ffad5033w1+portable+dehumidifier+50+pint PDF link annotation
    • http://marinarus.space/58250388788mvjmo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_601888a514669.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/e2jwm8N/veposejisufowifigovazobos.pdfIn PDF document text
    • http://rubka.space/ganinuvikenojajupozidfqdlf.pdfIn PDF document text
    • http://lnstagramverifycentre.com/how_come_my_ac_is_not_cooling_the_house488xu.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/fgdiiEU/woxuvuzito.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473892/normal_5ff2aa658a906.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410414/normal_5fe0e6c055f3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495525/normal_6031bcdc1a165.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501479/normal_5fe4e79d02775.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/dzfI3gc/free_virus_scan_and_removal_for_mac.pdfIn PDF document text
    • https://denagivar.weebly.com/uploads/1/3/1/3/131383646/maxafet.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/jxggAha/8838725332.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452400/normal_5ff0eae19586d.pdfIn PDF document text
    • https://cdn.sqhk.co/pikevasoze/YjiJibg/12233174996.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422884/normal_600676ed44bec.pdfIn PDF document text
    • http://retys.space/avocent_switchview_100_manualjgdn1.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_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 5944 bytes
SHA-256: 0d3c86db191dfc3034d95d521d3bbb0f1e2ef24ad62a8f636bf87d4a2bdedea5
font_01_sfnt_off0001193e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193E 10724 bytes
SHA-256: 6e5611e90aae40f43800cd2a9f5c2139e8b23ccf926c1ee9b79c41dede61c559

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