Malicious PDF — malware analysis report

Static analysis result for SHA-256 a080bd56b62d690a…

MALICIOUS

PDF

80.1 KB Created: 2021-01-21 11:12:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 46503d06ff1bdfc972814468dcc6aec4 SHA-1: 9811e1a2fd6ca4093a8d34e79ed05bc1eef2d607 SHA-256: a080bd56b62d690a5fd9601778f2a0d1f7f4d73ebe35e3328c8bc6a970b3a5e0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates a tracking or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=family+medicine+nbme+answers PDF link annotation
    • https://cdn.sqhk.co/penomufepuk/hishbG4/slice_factory_chicago_il_60608.pdfIn PDF document text
    • https://site-1168172.mozfiles.com/files/1168172/91205385650.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/d4ggjmK/ewallet._apk_free_download.pdfIn PDF document text
    • http://lorebip.22web.org/loxexixifagetatorur.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/6hhiiAX/49398612505.pdfIn PDF document text
    • https://cdn.sqhk.co/potebuso/Ogc46jc/resena_conquest_planet_earth.pdfIn PDF document text
    • https://site-1177836.mozfiles.com/files/1177836/nizolev.pdfIn PDF document text
    • https://site-1207255.mozfiles.com/files/1207255/2077140605.pdfIn PDF document text
    • https://site-1220496.mozfiles.com/files/1220496/37756166544.pdfIn PDF document text
    • https://cdn.sqhk.co/numavagoko/2ihYgia/cosmology_of_monsters_audiobook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://siparedobapu.rf.gd/kuxovuzesoxidavugokawi.pdfIn PDF document text
    • http://naditoliwinudev.epizy.com/xolodi.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/article_of_association_template_uk.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
    • 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_off0000e35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35F 5376 bytes
SHA-256: 17db3af60dfcc5b0d19f0071ad11a7c442583b3f40cf8f2f3e91e83107b5e105
font_01_sfnt_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 11932 bytes
SHA-256: 7d266124a63d0bdf3aecd7a5af4efd209e13267fdbde2f9e34266c0716adc2be
font_02_sfnt_off00011d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D37 16488 bytes
SHA-256: c25876e6fb72c40c95f12eb783f3556f26da1c1b761b6a00eb9c2f924d992bc1

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