Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4c8824759b0205…

MALICIOUS

PDF

73.2 KB Created: 2021-02-18 00:19:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2aff6549b5c12aa77b14b7370ffe1267 SHA-1: 6a13dfb77a5e62897b55173de41ae7255e80d77b SHA-256: ed4c8824759b0205e3e60cdcf42576251b0b49ca8787be83813b2fb80815a850
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=how+far+apart+should+bean+bag+toss+boards+be PDF link annotation
    • https://cdn.sqhk.co/zowolanazew/f7jhchh/ant_simulator_roblox_codes.pdfIn PDF document text
    • http://xugutolajon.22web.org/34000725446.pdfIn PDF document text
    • https://lufumapapolag.weebly.com/uploads/1/3/4/3/134353855/kilopapid_manananobono_zapijogom_towakusula.pdfIn PDF document text
    • http://nexekuwa.22web.org/81490720308.pdfIn PDF document text
    • https://cdn.sqhk.co/lamijaluxeso/ihylvtF/space_shooter_galaxy_best_ship.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411694/normal_5ff3ae5142d70.pdfIn PDF document text
    • https://bewotenugajuvu.weebly.com/uploads/1/3/2/6/132695730/a1b157263d8fe65.pdfIn PDF document text
    • https://vopesowe.weebly.com/uploads/1/3/4/6/134638419/7369706.pdfIn PDF document text
    • https://bomazadoxu.weebly.com/uploads/1/3/4/4/134474586/3e04fcc84.pdfIn PDF document text
    • https://kazubuxupopa.weebly.com/uploads/1/3/2/6/132696048/fuzelonefi-ditok-mazaz-siroxogobavepek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zadabodemuliju.epizy.com/42089649512.pdfIn PDF document text
    • http://rezafenunuritem.epizy.com/how_to.learn_photoshop.pdfIn PDF document text
    • http://melitere.epizy.com/isc_class_12_maths_syllabus.pdfIn PDF document text
    • http://bukepajusoka.rf.gd/25707292810.pdfIn PDF document text
    • http://witeguxatuzidaj.epizy.com/81654618920.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_off0000e137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE137 5496 bytes
SHA-256: 69ababb97ec2cad9260395001f668c4a41418ab01b6e3d79500ed8bb70acf026
font_01_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 10460 bytes
SHA-256: 1b50b3357e0cae8335c0d1f9ca07f8c307652942c7c38002f6f2302d2362ab5c