Malicious PDF — malware analysis report

Static analysis result for SHA-256 f746530332b4e8c0…

MALICIOUS

PDF

83.2 KB Created: 2021-02-22 03:08:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b3d53cee42dd541215d04562e0120fef SHA-1: f39cfce1a7eeb7984cc01e922ade9ba416f2a0c9 SHA-256: f746530332b4e8c0b0c3f0b4ccc584259b941def9fc81049ec385bc7302668ac
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The presence of a PDF link farm heuristic, along with numerous external URLs, suggests a tactic to redirect users to potentially harmful websites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or SEO manipulation scheme.

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 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.
  • 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://bologen.ru/wix?keyword=hoot+vocabulary+pdf PDF link annotation
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/mubozo.pdfIn PDF document text
    • https://wotewaga.weebly.com/uploads/1/3/4/6/134615540/6918779.pdfIn PDF document text
    • https://lotepipi.weebly.com/uploads/1/3/1/4/131454034/lulimesofama.pdfIn PDF document text
    • https://varupeneg.weebly.com/uploads/1/3/0/9/130969993/4050543.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/87997970975c90.pdfIn PDF document text
    • https://jumekurokenawuw.weebly.com/uploads/1/3/0/7/130739991/jogal_fexojagisutoli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xajowu/jolavu.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/how_to_backup_pc_with_wd_my_passport.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/zosajumavazunobenizuzirex.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/60983145286.pdfIn PDF document text
    • http://luzadewo.epizy.com/332474964.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/ruvexamavumenobutuzugaga.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/hotstar_app_free_for_samsung_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/arkham_asylum_a_serious_house_on_serious_earth_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/cheat_brave_frontier_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/xawugesudo.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_off00010842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10842 5236 bytes
SHA-256: cc94e927b9999b6ec2289715ef798cca845f3020a1af23f67124d1507263ed8c
font_01_sfnt_off00011a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A27 11092 bytes
SHA-256: 135ac2085e1d60a1cfdfdc6c0f55de3241f6c38ff4ee637842088d47ff972b36

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