Malicious PDF — malware analysis report

Static analysis result for SHA-256 660da777235c0a4e…

MALICIOUS

PDF

81.0 KB Created: 2021-03-31 12:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7666b41bd903bffab8a0e251870c9435 SHA-1: 231738d6e734fd78d42a9d1ba85e25cb36729c72 SHA-256: 660da777235c0a4efca97de479afa4b9955ac241bfa9d99bf111934dda863518
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URL `https://pelibifir.ru/wix?keyword=fixed+and+variable+expenses+worksheet+4th+grade` is likely the primary lure, directing users to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=fixed+and+variable+expenses+worksheet+4th+grade
    • https://taxesewisozigif.weebly.com/uploads/1/3/5/3/135394589/nazexuxifarugewapife.pdf
    • http://lifepax.iblogger.org/flatland_book.pdf
    • https://judezasisurag.weebly.com/uploads/1/3/4/4/134498900/235d4.pdf
    • https://wuwusafofe.weebly.com/uploads/1/3/4/6/134619260/187723.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fopalew/magic_bullet_army_study_guide.pdf
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_bc962eb158864ff8b713aa63f2d8717d.pdf?index=true
    • https://s3.amazonaws.com/napejaxosinages/price_of_epix.pdf
    • https://s3.amazonaws.com/jupudizadid/kolewisuwefobigilovu.pdf
    • https://s3.amazonaws.com/perurulexi/39666388161.pdf
    • https://s3.amazonaws.com/jupudizadid/74668313119.pdf
    • https://s3.amazonaws.com/luxelula/why_did_montresor_kill_fortunato_in_the_cask_of_amontillado.pdf
    • http://tasaronusofake.rf.gd/always_on_display_j7_prime.pdf
    • https://s3.amazonaws.com/wazotojemov/zorikavojotiwes.pdf
    • https://s3.amazonaws.com/savukojubusum/27092808693.pdf
    • http://pumatelikowe.epizy.com/punch_drink_pictures_free.pdf
    • https://s3.amazonaws.com/sifawekujiki/fisobagub.pdf
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_f7fc064f514d4764bd4025312c0b6c3c.pdf?index=true
    • https://s3.amazonaws.com/zesotat/96614183293.pdf
    • http://xurukat.rf.gd/16628179169.pdf
    • https://s3.amazonaws.com/zunaporam/61128942859.pdf
    • https://s3.amazonaws.com/masevewi/amazon_prime_mod_apk_apkmody.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd13.bin
fe581dfa36a8157913a75e58a7b393a17d29a4543084a0a31a0055b26cbf2861		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 5688 bytes
font_01_sfnt_off0001108b.bin
82df2d9bc306b63d42481a31ca6163cd973796f61b6f35ed3a121b96902fb0f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 11200 bytes

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