Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f0a586ef475619…

MALICIOUS

PDF

73.7 KB Created: 2021-03-23 04:55:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1baa5fb18a7c3a3d2a038545dde9db53 SHA-1: 2debc84db71ff27c1fa5caffd8de6209d31d2d59 SHA-256: a6f0a586ef4756192c29a4b1799cbf3c0a49d934c6fee7f5512fe80d957911ee
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The presence of a critical heuristic for PDF SEO link farms and ClamAV detection as Pdf.Phishing.Trojan indicates malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a "chrissy teigen cravings pdf download", directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/wix?keyword=chrissy+teigen+cravings+pdf+download
    • http://madokedaxemosu.22web.org/do_hybrids_have_higher_maintenance_costs.pdf
    • http://mivejuvididu.66ghz.com/sqlrpgle_free_format.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/kojikiwasatosewo.pdf
    • http://fakts.design/what_is_a_woman_pimp_calledlkoir.pdf
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/valarisofodo-zebika.pdf
    • https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/0ccecb345d34.pdf
    • http://reduslim-italiaofficial.site/mosejaxorozamakenefafudakbfiod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/regovadeje/bfa_alchemy_level_guide.pdf
    • https://s3.amazonaws.com/naxozelozude/kafujerabimanuguse.pdf
    • https://s3.amazonaws.com/wuniku/dragon_ball_z_androides_19_y_20.pdf
    • https://s3.amazonaws.com/farowug/25300311702.pdf
    • https://s3.amazonaws.com/wezukep/20976859492.pdf
    • https://s3.amazonaws.com/feborobegibew/53191725756.pdf
    • https://s3.amazonaws.com/legesiliv/28788623610.pdf
    • https://s3.amazonaws.com/vexosafugunu/mikazobiziwoxikekisinemit.pdf
    • https://s3.amazonaws.com/levovod/math_exercises_for_kindergarten.pdf
    • https://s3.amazonaws.com/tevomenil/kananojupimo.pdf
    • https://s3.amazonaws.com/numunenoji/14741712996.pdf
    • https://s3.amazonaws.com/xamibebulosaxug/debuvo.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_off0000e0ea.bin
4fbf70cbde68e6d8c44cbc3afa85d9bb1374ec4ccfb474e9b1bdd0e54df188b9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EA 5576 bytes
font_01_sfnt_off0000f3f9.bin
8eceab42518a5b315f1677fa4e89960754d5deb5deeafb8f4b9e32278ad26d13
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F9 10584 bytes