Malicious PDF — malware analysis report

Static analysis result for SHA-256 823fced7265de0a6…

MALICIOUS

PDF

105.3 KB Created: 2020-11-29 05:49:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6e306a5743c19fab443659f8e5bf1419 SHA-1: 1b003b9b0d4ab91d06802eff3475249d4c26364d SHA-256: 823fced7265de0a65dde678602385fe9fced7a64a65fc278e0658d1eaa2d68f8
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 hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://trafficel.ru/123?utm_term=audiovox+car+alarm+manual PDF link annotation
    • https://miwejezapelo.weebly.com/uploads/1/3/4/3/134342363/9023f77909bc171.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/5cb32b3a7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495390/normal_5fafa6719fba0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376854/normal_5fa01f74ea369.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/3173209.pdfIn PDF document text
    • https://luzofimufabo.weebly.com/uploads/1/3/4/5/134590143/zutovirijebud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_5f9d5e36caba2.pdfIn PDF document text
    • https://genaseturatu.weebly.com/uploads/1/3/4/6/134615139/8184752.pdfIn PDF document text
    • https://kofiwesufe.weebly.com/uploads/1/3/4/7/134748014/kusetiluk_vuraz_bidew.pdfIn PDF document text
    • https://xipazodi.weebly.com/uploads/1/3/4/3/134375507/nozufuzosenu.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/a825bd53.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/f16d3cd8-fe6d-4ff5-8dca-f873083dbc42/30445669318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d4cc73-47a8-447d-9cc0-675650aa97df/15227255859.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4A 5024 bytes
SHA-256: 80581af93b0ae714875ce6129a3efdfec691bf37ae158519a9e57860c0f563ca
font_01_sfnt_off00011f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4E 3720 bytes
SHA-256: a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9
font_02_sfnt_off00012aae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAE 12188 bytes
SHA-256: 02ec85ed44b9a995bacf4eb6263d2fb4eddf4a430b3fc4ffa2458ada266601f1
font_03_sfnt_off000153e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E8 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf
font_04_sfnt_off00016953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16953 15248 bytes
SHA-256: 434ca353e1d4985fe23ae9fbf0e59879a37b3c9c3cd84042e43457752cb92951