Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb36481b30d84b4…

MALICIOUS

PDF

70.0 KB Created: 2021-02-18 01:12:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5ceb0f402287f3df2af8ec186d7f6b59 SHA-1: 79cf6d9dde99f3949aaf3cb0493e8448ecec0c9a SHA-256: cdb36481b30d84b467a747f32dfe82224395e80f643c3a905fa8dfef921b0f54
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a product manual, aligning with common social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=eureka+the+boss+smart+vac+4870+manual PDF link annotation
    • http://crawlmqyu.space/chiari_2_malformation1a6pb.pdfIn PDF document text
    • http://ijmalan.xyz/carnegie_learning_algebra_1_answersk5z7d.pdfIn PDF document text
    • http://legalvictory.group/fotamagakefukuwenalis6weq.pdfIn PDF document text
    • http://lazerepil.site/9558690559y3e11.pdfIn PDF document text
    • http://watasanu.iblogger.org/chaney_electronics_learn_to_solder_kit.pdfIn PDF document text
    • https://kelonefak.weebly.com/uploads/1/3/2/6/132683111/5903872.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/voninuxapetireniz.pdfIn PDF document text
    • https://golakabuzoved.weebly.com/uploads/1/3/4/8/134870140/8773ad6.pdfIn PDF document text
    • https://nowiwadigomu.weebly.com/uploads/1/3/4/0/134018048/103373.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/xaxugabirevuzdd43p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459641/normal_601761d4a8951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484641/normal_600ab308f3a54.pdfIn PDF document text
    • http://copyright-securityx.com/new_movies_website_2019byjh8.pdfIn PDF document text
    • http://ca-management.website/ms_dhoni_movie_in_hdy8f89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486042/normal_5ffe919b6021d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vezuzatutuxi.epizy.com/sample_compliance_matrix_template.pdfIn PDF document text
    • http://bavejoxobev.epizy.com/should_i_read_the_handmaids_tale_before_the_testaments.pdfIn PDF document text
    • http://xokeraje.rf.gd/algebra_2_problem_solving_worksheets.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_off0000d561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD561 5764 bytes
SHA-256: 80a65a6da94a77aaffc8de2f5db9c45ce21808bdb8f8b0ee3169f6944021700e
font_01_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 9892 bytes
SHA-256: d3b7eba6b98f53fb3cfca87616b8e6bf079fbf6342db1ef170ad520742437150

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