Malicious PDF — malware analysis report

Static analysis result for SHA-256 2637d88340094c90…

MALICIOUS

PDF

99.2 KB Created: 2021-04-09 17:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8d1add658a38d8a01360e87a782a1f5b SHA-1: dd03fdf16e20a63e9af2c8b44436eaac3dd7973a SHA-256: 2637d88340094c90b016273f254eaa317878186c500fd96e0009502144049d5c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/strik?utm_term=what+is+affirmative+proposition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446790/normal_605884c81677d.pdfIn PDF document text
    • http://ek-arenda.ru/busepakeginy1yk6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451555/normal_60412d621fc99.pdfIn PDF document text
    • http://korecos.ru/65755177695wmr0f.pdfIn PDF document text
    • http://tikovg.xyz/is_there_supposed_to_be_water_in_the_salt_tank_of_a_water_softenerbq7lp.pdfIn PDF document text
    • http://funolodezesigit.iblogger.org/laserjet_m1212nf_mfp_service_manual.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/buwazanozepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497082/normal_5fd9670c8042b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485823/normal_6016275c8453b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448347/normal_5fee984716e56.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382639/normal_5fe43a7b6f90c.pdfIn PDF document text
    • http://civiliscmq.online/siwazemalotejurfik5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_60593d58ea4a4.pdfIn PDF document text
    • https://likixadukevagal.weebly.com/uploads/1/3/4/7/134700169/pidusitozaw.pdfIn PDF document text
    • http://joy-todays.online/guwodenijibadpqfdv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402517/normal_5ffa86ef8f9cf.pdfIn PDF document text
    • https://degebemug.weebly.com/uploads/1/3/0/8/130814630/3979303.pdfIn PDF document text
    • https://povarudoro.weebly.com/uploads/1/3/5/3/135324530/9d9f8a8568c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_7798be21242545088617990902ef2490.pdf?index=trueIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_431caad327d24d6190b1b4fe98126b8f.pdf?index=trueIn PDF document text
    • http://guxodolabisiruj.epizy.com/24676311356.pdfIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_eb03e18f5b614f74987526d6aeeeac3e.pdf?index=trueIn PDF document text
    • http://jurolabadujo.rf.gd/prepa_abierta_ingles_1.pdfIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_7c58f1ea1d464c34802baaef72396e0a.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E9 5184 bytes
SHA-256: 794ed640fc997fb2cc698823aa8ae15d3baa89fce934a4f38553c005cee82dce
font_01_sfnt_off00015772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15772 11476 bytes
SHA-256: 8bac810b8e48d49389c257235b29130a67d717a0aec80f7407744430fbdba682

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