Malicious PDF — malware analysis report

Static analysis result for SHA-256 11de034d1b421c7b…

MALICIOUS

PDF

80.9 KB Created: 2021-05-28 09:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c1ce383b8490de461c72b3c6fa40684b SHA-1: e7ea45c0280032342ef85bc074487bf162788ce2 SHA-256: 11de034d1b421c7b1df48637e3e00bc35534d97d572f955aab90335df74f0382
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to redirect users to malicious sites. The embedded URLs and the nature of the link farm strongly suggest an attempt to lure users into clicking through to potentially harmful content.

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://midufefew.ru/123?utm_term=android+automotive+tutorial PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418984/normal_6012f82d8fced.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370267/normal_5fe0ee02ceb6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_60183e27b981f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424982/normal_6005f6006fed8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476146/normal_5fcd7c7c6d92e.pdfIn PDF document text
    • https://tusukufuduma.weebly.com/uploads/1/3/4/4/134458322/80b6aa1d0.pdfIn PDF document text
    • https://nafugawiwira.weebly.com/uploads/1/3/1/4/131438392/wunulorok_gaxap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_6040afc9eb15d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500668/normal_604e4657d6fd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416790/normal_5fd7967669d64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381544/normal_6007de1bc0a81.pdfIn PDF document text
    • https://pipizodo.weebly.com/uploads/1/3/4/3/134352326/mawujigaxobeze.pdfIn PDF document text
    • https://wawukonuxoni.weebly.com/uploads/1/3/4/0/134095992/254a2cb8.pdfIn PDF document text
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/f7c611a3fcd.pdfIn PDF document text
    • https://zudavarasosala.weebly.com/uploads/1/3/4/2/134266164/mebatedi.pdfIn PDF document text
    • https://divoguwobumiwes.weebly.com/uploads/1/3/4/4/134487338/5894359.pdfIn PDF document text
    • https://pozefixinez.weebly.com/uploads/1/3/1/4/131454190/soxifeku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461483/normal_5fc68e191573e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_5fd5f135e48e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468814/normal_604a5b79c8fba.pdfIn PDF document text
    • https://mijagipiked.weebly.com/uploads/1/3/4/5/134524971/xikiwabizubube.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/c604df18-81d4-4993-b3b3-25b85a2a6058/70903400407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7369d12-2305-4ef9-802e-9a2362ea694c/stranger_things_3_neverending_story_episode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2371db17-f268-4c8b-b4f0-2b6d2e9f3a97/49793502777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/435cbf74-ebec-4b94-b0ba-265481fbe92d/ketogenic_diet_for_beginners.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_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 4844 bytes
SHA-256: d0f0cf80401bff29eb74e7b5d16ae624706526706ec0908decdf766088e5beb3
font_01_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 11120 bytes
SHA-256: eb3464ad303778c40ebf9c91d2d62d3d5d05b9481c3d27e39e8c5cd60efa4d53