Malicious PDF — malware analysis report

Static analysis result for SHA-256 97eb5cbcafbde30c…

MALICIOUS

PDF

70.4 KB Created: 2021-03-03 04:58:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 920bfddaa68cfed524c6ffae5b1c19b2 SHA-1: ce6a7de00b406e13cc6146befee89b2a5b69e30b SHA-256: 97eb5cbcafbde30c4c3c200e5a81f55f6b0b15f0a26f5bdedd517a3e9c7ff87f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=uniden+um435+review PDF link annotation
    • https://cdn.sqhk.co/vizelupavew/aHNCgdo/6568397622.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenilu/jiiepgg/patani.pdfIn PDF document text
    • http://nekretnine.site/limitless_template_github9dmln.pdfIn PDF document text
    • https://novigavaze.weebly.com/uploads/1/3/0/8/130874354/7861633.pdfIn PDF document text
    • https://cdn.sqhk.co/zatugudaxaji/iQTjiL4/xagutewigowanixifo.pdfIn PDF document text
    • https://cdn.sqhk.co/bejamisokepu/xHijicP/34440882093.pdfIn PDF document text
    • https://cdn.sqhk.co/kafekogi/0maVShe/89606062321.pdfIn PDF document text
    • https://tovibebifenoge.weebly.com/uploads/1/3/2/6/132695438/panagabasewifa_burufod_xutuxurugukip_kakebaveson.pdfIn PDF document text
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/mibabikaxitisejavepa.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/gEicDgd/81894091686.pdfIn PDF document text
    • https://nitomono.weebly.com/uploads/1/3/1/4/131454496/pijogogalax.pdfIn PDF document text
    • https://cdn.sqhk.co/rudolikube/SJgeidH/crowd_city_zombie_skin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zosuwowatapaji.rf.gd/nike_air_force_1_sage_low_womens_shoes_white_7.5.pdfIn PDF document text
    • http://xuperag.epizy.com/interval_notation_and_set_notation_worksheet.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_off0000d753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 5072 bytes
SHA-256: 57227e16e607efe59f58a532ea15e2fd45bae2dd25bc99ef19b537d1a2d60e45
font_01_sfnt_off0000e8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A2 10728 bytes
SHA-256: 5db415bd68eaa7a50c893fd8be21bfb1b7ad15a68cc329ba7af479b071a1e62c

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