Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac748240d8d95255…

MALICIOUS

PDF

76.3 KB Created: 2021-02-13 17:38:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 00ff77e0d1f1c4a7e9419254bea953e4 SHA-1: aaad21cefbe745c2a5014ed646f1529aded49ed3 SHA-256: ac748240d8d952553b849c70f489f8af54c0a2217705eb69d5199cd87069e547
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and is flagged as a link farm. The document body, though heavily obfuscated, appears to contain metadata related to a 'Casio privia px- 130 repair manual', suggesting a lure. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with a high ML score and ClamAV detection, strongly indicates malicious intent for SEO-based phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://seumenha.ru/aws?utm_term=casio+privia+px-+130+repair+manual PDF link annotation
    • https://widegavadiwudux.weebly.com/uploads/1/3/5/3/135325068/8db08.pdfIn PDF document text
    • http://vivabozuna.iblogger.org/rafuje.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/nivojaxuv_rumanavegovid.pdfIn PDF document text
    • https://wovipoxutoluku.weebly.com/uploads/1/3/1/3/131383624/mizebufarexu_zadirozekakelel_mewegaxenax_nukogu.pdfIn PDF document text
    • https://vavuwujaxozu.weebly.com/uploads/1/3/1/0/131070334/munekur-betamib.pdfIn PDF document text
    • http://bas-vorota.ru/wolfteam_suriye_indirttazx.pdfIn PDF document text
    • https://nikigetevakawu.weebly.com/uploads/1/3/1/4/131413362/6443514.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/rayman_adventures_keine_incrediballsf5iam.pdfIn PDF document text
    • http://velavedi.iblogger.org/brackets_portable_free.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/lolaritemukole/wegotikirawobomudizalawi.pdfIn PDF document text
    • http://lamupilabixekuw.epizy.com/beats_earphones_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/19131472945.pdfIn PDF document text
    • http://pojafuda.rf.gd/formel_anlagendeckungsgrad_1.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/anatomy_program_for_pc_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 5388 bytes
SHA-256: 9ba1723d6dbb12faec99bb89fd31f4f170a26b123feb9cfbb6bea0a4dae1e63f
font_01_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 11372 bytes
SHA-256: 05cd1ed08498479c08b2839b1319d6194d9b7f3f221ef1129ccdd3158993d6ed

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