Malicious PDF — malware analysis report

Static analysis result for SHA-256 c924162f02de9bec…

MALICIOUS

PDF

81.2 KB Created: 2021-05-06 23:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 79a1f2ef0373404a62770220b14cdfdf SHA-1: 21f138a97d2c82632114b17901dbb374aca5b607 SHA-256: c924162f02de9becdc1af7cfe8353d5edb7197dcb8d4b03b5e6ff54272af3f6c
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. A heuristic identified an image lure linking to an SEO redirector, specifically `https://pelibifir.ru/strik?utm_term=how+tall+is+attack+on+titan+characters`, which is a common tactic for phishing or malware delivery. The document body, though heavily obfuscated, contains text related to 'Attack on Titan' characters, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://pelibifir.ru/strik?utm_term=how+tall+is+attack+on+titan+characters PDF link annotation
    • http://kapabifidi.sportsontheweb.net/89606621187.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/gddMb57/57132307325.pdfIn PDF document text
    • https://cdn.sqhk.co/resesexiraf/igi0Xie/wordpress_themes_for_content_writers.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/assurance_and_insurance.pdfIn PDF document text
    • http://firobazotu.sportsontheweb.net/69021620191.pdfIn PDF document text
    • https://cdn.sqhk.co/zejovedelali/gcWSrjf/renudapegof.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/33358227677.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_e8ed9723fe8a48a39fdd6881775bd0a0.pdf?index=trueIn PDF document text
    • http://ditajizuru.rf.gd/12639409672.pdfIn PDF document text
    • http://sakodaletop.rf.gd/pepugerobum.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/nigukisonewe.pdfIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_166fc9fb190a4b178c55f44d2fdd124b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupuxus/guvusedopikibibesif.pdfIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_e2d14431b7a747e5b053b949e1e47ac4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/why_is_my_fitbit_versa_charger_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12fd754e-8a30-4ac7-a7c4-b57c0f17516b/vadedowozexenusaxiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/lotewodebeze.pdfIn PDF document text
    • https://1b6a1bbc-c127-422b-858f-c975555fd18f.filesusr.com/ugd/31f47c_813fdfa98c484202896b4911ddf14bb2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a8777ef-adec-4a3e-bce2-173eecf3e131/how_to_install_chicco_infant_insert.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_off0000ff5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5C 5004 bytes
SHA-256: 86f6c3c35734cf1d26d682693e702b0bdd15e3804f06ee8802cc8b73d17a20c4
font_01_sfnt_off00011067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11067 11320 bytes
SHA-256: 2e28bf39fe4c766badb7c1974f6d8658db97efdc48a467049aec88e5bad2c9da

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