Malicious PDF — malware analysis report

Static analysis result for SHA-256 737a53fd125e9d75…

MALICIOUS

PDF

62.9 KB Created: 2021-01-10 17:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 922c14d2cb322b44d7d5d0f671abf49b SHA-1: 527154cc00b4540d58f3418c594ac89a266e43c3 SHA-256: 737a53fd125e9d75149eedee6dfcd221debc503e04a4bcc86c092689526c6996
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not directly executable in this PDF context, points towards potential exploitation techniques.

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.
  • 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://traffset.ru/123?utm_term=baby+boy+da+prince+ig PDF link annotation
    • https://cdn.sqhk.co/folamudoj/ibieZie/24178070896.pdfIn PDF document text
    • https://cdn.sqhk.co/lanasido/4uhbtnx/7613932566.pdfIn PDF document text
    • https://rulozakowix.weebly.com/uploads/1/3/4/7/134730123/musajovemafisepirefa.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/YSjViM2/bojunekilefivefiv.pdfIn PDF document text
    • https://zukolarosaku.weebly.com/uploads/1/3/4/6/134662459/tufabelibojo.pdfIn PDF document text
    • https://pefodiral.weebly.com/uploads/1/3/4/4/134476409/jezagawige-bewuwotepikos-vufaw-fawenamovad.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/3846485.pdfIn PDF document text
    • https://jalipixax.weebly.com/uploads/1/3/4/3/134340191/bozodutesin.pdfIn PDF document text
    • https://jawemojope.weebly.com/uploads/1/3/4/3/134399256/1749985.pdfIn PDF document text
    • https://zumavekuganupa.weebly.com/uploads/1/3/4/3/134366180/wefavulukibinus_liwifak.pdfIn PDF document text
    • https://xadutodibuj.weebly.com/uploads/1/3/1/1/131164520/jokumazaxalawebevav.pdfIn PDF document text
    • https://xetasigebe.weebly.com/uploads/1/3/4/4/134443645/poweduvizukit.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/ibRwjhJ/easy_classical_piano_songs_sheet_music.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/jazuravazaguz/74372316370.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/arma_3_zeus_dlc.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_off0000b815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB815 5324 bytes
SHA-256: f24fb9334260d52bb25dba7d13be31084c7e52b7e02e8d66e975f86cba90fb64
font_01_sfnt_off0000ca40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA40 10760 bytes
SHA-256: d18a1bb3ed0fe24fca7190a43181d6ad57572592075048fa8575c900ae2c204d

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