Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d59481873e7447…

MALICIOUS

PDF

81.0 KB Created: 2021-03-20 18:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 671f391f736430ffb0230ecf8f3fc214 SHA-1: 7353100626f77a0552994a4ff03aeb65b36d9a98 SHA-256: 11d59481873e74470cda712252c8c5c464fb4940945fbb7f5c1b55715d4e55cc
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, indicating a link farm or SEO manipulation tactic. One URL, https://fokemale.ru/wix?keyword=2020+superduty+high+idle+features, is flagged as unknown reputation, suggesting a potential malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to 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://fokemale.ru/wix?keyword=2020+superduty+high+idle+features PDF link annotation
    • https://masenajeronuzes.weebly.com/uploads/1/3/1/6/131637464/4606284.pdfIn PDF document text
    • https://bugojexipu.weebly.com/uploads/1/3/1/3/131398417/9526652.pdfIn PDF document text
    • https://rugisuvo.weebly.com/uploads/1/3/4/4/134438002/1178344.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e776c8d0-927b-4974-ac53-280295b9a3cd/woods_l59_belly_mower_belt_routing.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_4caed648b1fc4743b386a122d1230fbc.pdf?index=trueIn PDF document text
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_3e74be6e4f2a4a4b977ea1c0ab47817f.pdf?index=trueIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_e48554cce9df42cd9e4da4c7b43a19a5.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_f3ff8d3ce71f445a8362e175c3fa7125.pdf?index=trueIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_d0b812272c6e494a8174febc3bae6624.pdf?index=trueIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_ce22b1cb2f2641029deaaf45c93442df.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/773e2d18-309d-4fae-81e9-94e25fa9b98c/pixurewodezeparap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa813dc-6ba0-4c52-9fb3-cb0d2750fbda/zemudusuzasebur.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_c179bc4387c94b30a4116dce45824d2c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd3fdb8-7858-41b2-8063-4fbdac498bd8/how_to_solve_a_maths_problem_wikihow.pdfIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_379a66807dfe4bd4b48b96034ea2e4b1.pdf?index=trueIn PDF document text
    • http://gamelaluwer.myartsonline.com/kalabhairava_ashtakam_english.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_3ed0c3de81c44ccfbe72ed48808aef09.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_58f71e77422e49b9886c1705c4c51852.pdf?index=trueIn PDF document text
    • http://pexirud.onlinewebshop.net/82866225095.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_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 5584 bytes
SHA-256: c09de06b7a200f56634510ce4500e072702ddf139b6fb9c3540d560a915f5964
font_01_sfnt_off00010ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF2 11804 bytes
SHA-256: 413f49b735b3d71f186413a9e353649d996d8cf48840a9d4e08d17075059aca6