Malicious PDF — malware analysis report

Static analysis result for SHA-256 953844a785bccb96…

MALICIOUS

PDF

78.5 KB Created: 2021-04-06 19:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 98f04af6aed9945e7f0deb8c69d1a1cb SHA-1: 510ebf83d2fc6eb095eca9634595ae47336662f7 SHA-256: 953844a785bccb96a21e5efe38a2d4ffd4322223a695ae29d0a4b9aadc0fd380
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://crophysi.ru/award?keyword=aspirina+mecanismo+de+accion+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500425/normal_5fcd36df25d23.pdfIn PDF document text
    • http://voseboler.iblogger.org/sadulatelilazas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449968/normal_6000e84c8efa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_601f047b5c7fc.pdfIn PDF document text
    • http://devubowoku.mypressonline.com/boxudinesudigefetakit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383471/normal_605a7dc24aab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_603f0a932dc4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498404/normal_5feb3cfcb5b3c.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/i3jiXgi/18503917908.pdfIn PDF document text
    • http://rabemedexisubis.mygamesonline.org/canon_in_d_piano_y_violin.pdfIn PDF document text
    • https://cdn.sqhk.co/savekedeg/dhiwjaC/30067865422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388427/normal_604f5a05a06cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505159/normal_6012c112177c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pisironebininuw.rf.gd/how_to_cite_primary_sources_in_chicago_style.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/65359349292.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/lokamobemi.pdfIn PDF document text
    • http://gegavolaful.epizy.com/interview_definition.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_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 5260 bytes
SHA-256: a46e4b73b859fe0b51b77f46503ed7ca77ac9670d497868cc639684112ec2952
font_01_sfnt_off000102c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 12792 bytes
SHA-256: b218185ac6d11241f9aa112aa52d5536b1b6c741101598a4620bb4978e9fc80a

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