Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e002df55a7cdfc…

MALICIOUS

PDF

69.3 KB Created: 2021-10-01 14:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1c83f6dff9a8b5bb58a5e6ec2cef5bf5 SHA-1: d67d639f1c1833bad9415695d9304a8310e4d083 SHA-256: 38e002df55a7cdfcb113c6fe0ff8ca7beb17b262d2895d3022c82eb1424c9a24
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to a site offering 'buy instagram followers free trial', suggesting a phishing or scam lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is designed to host multiple links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=buy+instagram+followers+free+trial PDF link annotation
    • http://quiltingacademy.net/fckeditor/userfiles/file/tukabonorudodojelujadi.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/kokamomom.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/xuritodenepufomesiva.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/31335326300.pdfIn PDF document text
    • http://boki.hu/editor_up/79853178076.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/riwarozatas.pdfIn PDF document text
    • http://scsychem.com/upload/files/81955556346.pdfIn PDF document text
    • http://ipublicity.cz/data/file/42380061436.pdfIn PDF document text
    • http://recrute.fr/files/files/57179004267.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/daaf14c989983f602de80c2bf7211b4f/tewakibafakebopomizuwubed.pdfIn PDF document text
    • https://shevian.com/images/file/bariro.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/32897369191.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/jofopevijaxu.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/33977724326.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/wenekifatejawuvawusagiw.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/59766004248.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/jufifozisidujaparefe.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/67592857403.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/govewulagitizosizodotu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150f7e7d81ad---40299526938.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/56519016041.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/duzepaloxobad.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_off0000ac07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC07 15980 bytes
SHA-256: c967d933480bb6d7e3ad84eb5e85f14a18cde21b21b07803f2e110176d6fcbf3
font_01_sfnt_off0000d45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 10912 bytes
SHA-256: dcd41146efd2385ba1cc0574c1e057e386f38ca2b971b9f6348ec36873f4b0c8

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