Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c923c2d413c6b8…

MALICIOUS

PDF

85.6 KB Created: 2021-03-29 01:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8e20a6cc102b1d012d4c336c8e03f5ce SHA-1: 78d5c9582b379284401de14cc366bc457dff1152 SHA-256: 32c923c2d413c6b8d76862761f1b1b625ad8136962f7f26ea937ff523c49d05a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment used to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=manual+de+servicio+impresora+hp+laserjet+p1606dn
    • http://rubyshup.space/26182827135ep733.pdf
    • http://bitjoms.xyz/25700041297pjnac.pdf
    • https://roxejozojone.weebly.com/uploads/1/3/0/9/130969259/jodokotutadal.pdf
    • http://form-lnstagramverificationbadge.com/xefagivuwogosogiwavc686k.pdf
    • https://static.s123-cdn-static.com/uploads/4496811/normal_5ff919ca619f4.pdf
    • https://static.s123-cdn-static.com/uploads/4447497/normal_5ffad1cec1d52.pdf
    • http://kapusta.pro/why_does_my_rv_carbon_monoxide_detector_keep_beepinggv66s.pdf
    • https://genaxixa.weebly.com/uploads/1/3/1/4/131437685/3710712.pdf
    • http://ins.expert/line_disney_tsum_tsum_wikie9yoy.pdf
    • https://surupipenip.weebly.com/uploads/1/3/1/8/131856971/nidututukus.pdf
    • https://ribarifi.weebly.com/uploads/1/3/4/2/134266405/wuzex_wojafi.pdf
    • https://static.s123-cdn-static.com/uploads/4488090/normal_5fcceb53b8223.pdf
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/xodepizojegefa-tigusipo-misesoripi.pdf
    • http://ighelpcenter.xyz/what_does_self_knowledge_meanbazpe.pdf
    • http://scoretdho.best/59771558151jx7a9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gojofim.epizy.com/android_vs_linux_kernel_differences.pdf
    • https://s3.amazonaws.com/tolivajupeku/best_dual_sensor_battery_operated_smoke_alarm.pdf
    • https://s3.amazonaws.com/fatisake/43508450703.pdf
    • https://s3.amazonaws.com/wogikokuzotaxa/amma_telanganama_song_naa_songs.pdf
    • https://s3.amazonaws.com/gelawiweza/how_to_change_my_mifi_password.pdf
    • http://zumuwojik.rf.gd/subject_line_for_email_asking_for_information.pdf
    • http://gitogopafo.epizy.com/lasomilokisajowek.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ba.bin
a92407359e4b439136631b6f5a181c8fe49966288022f74a8d491f79238bc458		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 5804 bytes
font_01_sfnt_off00010a6d.bin
be6ac5c48ab58a7909957348c30ada80a15fe361a73e5ee4b862cdb56d177162		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 11796 bytes
font_02_sfnt_off00013134.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13134 16204 bytes

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