Malicious PDF — malware analysis report

Static analysis result for SHA-256 651091f4b9a8be33…

MALICIOUS

PDF

82.0 KB Created: 2021-05-14 21:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 927bb52a3d00199948c0bef302e5b87b SHA-1: 5c9ff06025c9378b3182000968dc77d584839f29 SHA-256: 651091f4b9a8be33bbc22482c754c9a1a8357eb93b2f6c699297e6c4d1fbd97d
196 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 multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains numerous external links, with a prominent one redirecting through 'mezovuduw.ru' to a PDF file, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains text related to a 'Harry Potter characters emoji quiz', serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/strik?utm_term=harry+potter+characters+emoji+quiz PDF link annotation
    • http://verifybadgesbusiness.com/47933466637dyp65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481155/normal_600f20d5a5f9b.pdfIn PDF document text
    • http://startask.ru/potimoborewejafopogibsqpn2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_6033af6fa7b76.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/short_a_worksheets_for_kindergarten.pdfIn PDF document text
    • http://tujukesabegakom.mygamesonline.org/autometrica_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365540/normal_5feb26ab9a110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455370/normal_601c89a137514.pdfIn PDF document text
    • http://novubelugalij.medianewsonline.com/rpg_character_backstory_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kavuduvolilazod.myartsonline.com/99785091722.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/31433268283.pdfIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_c2503095807a490b9562309481f3d006.pdf?index=trueIn PDF document text
    • http://fazobelo.onlinewebshop.net/furufe.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/chiranjeevi_cinema_saira_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/58151407404.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/94860161034.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/84758851769.pdfIn PDF document text
    • https://f5d5bca3-0ffd-41e3-a77d-3d805a1e43e5.filesusr.com/ugd/4e23ca_72b2dd527c204b23b1f8e2856a198bef.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 5232 bytes
SHA-256: ac50cdb973f50f527aa534d090a8089412c0f50ab3cf73021852c3a61b741bbe
font_01_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 11228 bytes
SHA-256: c28c4a66d156d76186f9bedd8ace4785219938c16a11949d630220fa2653d9b0
font_02_sfnt_off00012c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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