Malicious PDF — malware analysis report

Static analysis result for SHA-256 880e790aa03bba60…

MALICIOUS

PDF

95.9 KB Created: 2021-02-14 21:11:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ab07defc7d132b5546b559a2591cf8d1 SHA-1: f2e300c6f4239a277c4d9badd7bc4a0c31cf414a SHA-256: 880e790aa03bba60fc694516a412c3964480578933258d188ec39dfab0a5f4ae
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or SEO spamming campaign. The PDF's structure and the presence of many external links suggest it's part of a larger operation to redirect users to potentially harmful content.

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/123?utm_term=controlling+idea+definition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367312/normal_601f3fd0ce4bb.pdfIn PDF document text
    • http://slmit.space/fibadararisukisi3oors.pdfIn PDF document text
    • http://daimontimur.org/26809052018tw3rb.pdfIn PDF document text
    • https://cdn.sqhk.co/risejesob/jifiiia/missile_crisis_in_cuban_essay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_6026e5b5571f5.pdfIn PDF document text
    • https://cdn.sqhk.co/lesepivir/dETNiev/download_bridge_constructor_simulator_mod_apk.pdfIn PDF document text
    • http://llloooodddd.space/hw1dh.pdfIn PDF document text
    • http://winnerslm.space/jopizx13o0.pdfIn PDF document text
    • http://help-copyrightservice.xyz/ableton_live_10_free_for_pcgl6g6.pdfIn PDF document text
    • http://rentline.pro/homework_rubric_samplezu4sd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483354/normal_600400bb29efd.pdfIn PDF document text
    • http://vizit.store/27309229526eu7g7.pdfIn PDF document text
    • https://jevixivuxed.weebly.com/uploads/1/3/4/6/134622771/pusujigifu-konoranumano-kamoxuwu-sipetav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413467/normal_60297322bfb94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421957/normal_5ffe98c6a1ee8.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/wurili_xivezinukezawul_wamaxekefako_pixitaxelija.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000156b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x156B8 18028 bytes
SHA-256: 1417b92a55668e13f9ab3ad6c2d13d09637951ef2fdfacc9700f985ad626058f
font_00_sfnt_off000121d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D5 4800 bytes
SHA-256: f727d6ba25dddfb3ad06c230cccd830c38a08437cd5648d3ae95dda26e9a655d
font_01_sfnt_off00013235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13235 10784 bytes
SHA-256: 764341f60ef4d9098588316461ac2b4c68162deeeb9f5260f0482d56743be866

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