Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c7b5260abc5d3a…

MALICIOUS

PDF

64.0 KB Created: 2021-02-10 16:12:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f86ccf7be710cf354f5d41f2a742d8d2 SHA-1: b457bc5ab24fcfbeeb0eb3e3389919fb6f15ee54 SHA-256: 77c7b5260abc5d3a480d4eccec894877720762fdbde46341e06272ca72831642
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document contains a mass link farm, with numerous URLs pointing to potentially malicious content, including a redirector. The document body, though partially corrupted, suggests a lure related to a 'job form'. The presence of multiple PDF links and the use of disposable hosting indicate a campaign to distribute malware or phishing content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wb?keyword=bc%20pnp%20job%20form In PDF document text
    • http://sfhgfje5df.xyz/jakipikaxijovikawopanala4vj.pdfIn PDF document text
    • http://neo-tp.ru/insanity_max_30_workout_calendarz429j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423155/normal_5fc88d494c1ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392210/normal_601b1ea43de40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495395/normal_5feeef75581fc.pdfIn PDF document text
    • http://qwert-ita.fun/giripoxemukerik2eqae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_600d42a211c83.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/audiobook_won_t_on_iphone1j2fn.pdfIn PDF document text
    • https://suwekamepegatir.weebly.com/uploads/1/3/2/6/132682685/durikow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_5fe78f2c0e931.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485702/normal_5fe05e4dee468.pdfIn PDF document text
    • http://cashbackmoney.info/noxomusctw3o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465264/normal_6022f009e8cca.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_off0000bfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC5 5004 bytes
SHA-256: 9388d282ff3967ce933ebfbd9e5276cef749dec8760dc6113ff996c0aa7fd78d
font_01_sfnt_off0000d0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BF 10220 bytes
SHA-256: f0322b178309511a5cebb04d333c3cd2c3d76bff0e23d6501d085c1b5cddc6ab

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