Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3a6adb0458f9c4…

MALICIOUS

PDF

75.4 KB Created: 2021-09-14 14:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e28ca0a02c578c497b251899d9e23d73 SHA-1: 160fef801b37f5cab936636135f2bf630db0b667 SHA-256: 1c3a6adb0458f9c43c11e1985b600bf1f047bbb1139bc6f634e0badcd5f8cb3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=auto+liker+for+facebook+apk PDF link annotation
    • http://kalkulacka-hypo.cz/userfiles/files/jotasipafiwegetigijeb.pdfIn PDF document text
    • http://dinhviht.com/images/newtech/files/xamomoviporigeruroligonip.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/97164673057.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/pizaxiviwupoguzazuj.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/botufixeleneneniguro.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/79345282711.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/tamaxenexib.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/sedoxumusazor.pdfIn PDF document text
    • https://agermag.ro/mm/file/divafemi.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/1219853700.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/11944340251.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/93524543326.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/viruzodun.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613153c9f3a14---8534726994.pdfIn PDF document text
    • http://badgerhillfarm.uk/19961888868.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/12830146571.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210913_7AAB264584F91A2C.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/lazumasiwogo.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/zejorogeviribakotujera.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/gafigesilarikite.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/70274245254.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37B 10516 bytes
SHA-256: af90b54caebd3afe027d28bb18635b9c74798322c34465d979c8132a8479c2c1
font_01_sfnt_off0000db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 17240 bytes
SHA-256: 9f4482c0251c12be91a8971e9da4577a56439b950720980b30060688a1d35dfb
font_02_sfnt_off000107cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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