Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f0b4c5aa1dda8b…

MALICIOUS

PDF

70.6 KB Created: 2021-01-20 15:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 165cafa2eda1676576fafb516d8b5aea SHA-1: 75d5d43e4570894f443a1aad68d66a30b967664a SHA-256: e3f0b4c5aa1dda8bfce4a15ed5596dcc554ab6201d663cbca489cdaa1f75b4b7
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, a technique often used for SEO manipulation or to redirect users to phishing or malware hosting sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest this document is part of a link farm operation designed to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://maypoin.ru/123?utm_term=what+is+a+non+numeric+character PDF link annotation
    • https://cdn.sqhk.co/bitizulokiva/qOjcY86/59067635620.pdfIn PDF document text
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/9f4c05b9682.pdfIn PDF document text
    • https://cdn.sqhk.co/texivewa/jhjhfhg/ates_ve_su_2015_oyun_45.pdfIn PDF document text
    • https://site-1167941.mozfiles.com/files/1167941/74168935135.pdfIn PDF document text
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/5050935.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/heihjfg/53375753061.pdfIn PDF document text
    • https://nasotatuji.weebly.com/uploads/1/3/4/3/134392375/nafakop_basafofewopif_kifezabifati.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/84965243921.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/approaches_to_evaluation.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/botim_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/chipmunks_happy_birthday_mp4_video.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/komireg.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/instagram_followers_app_2019.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_off0000d04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04E 5020 bytes
SHA-256: 49952ad1b1b8c4fae648564b47fea2d2e8e81608f3e84c9bbf9ee9a7125f990b
font_01_sfnt_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 13000 bytes
SHA-256: bc9b2389874c3ec0574ea60b861a72254b04121cfee659c5ed22f6e3092bc9a9

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