Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3519929f34215b…

MALICIOUS

PDF

81.8 KB Created: 2021-05-28 13:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8beb8115f3e4183bc49ca204c97c63ad SHA-1: ac4a87c8e19c42f2fa6cbedaa25164bd95ffe223 SHA-256: 1b3519929f34215b5eb7f369b65fb9c4e397d369a05304fab065240d0ef76464
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. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=what+is+determinism+in+human+geography PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379726/normal_606047f002fd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_600b41e4230eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393019/normal_6048655d3369e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450340/normal_6006280d6cf09.pdfIn PDF document text
    • https://fevowavekotaxuw.weebly.com/uploads/1/3/4/6/134635114/dabokoj-vigudi.pdfIn PDF document text
    • https://nirasiban.weebly.com/uploads/1/3/4/3/134344158/zixekat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385014/normal_5ff352c8af508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_603e4037d6634.pdfIn PDF document text
    • https://renesixedobalew.weebly.com/uploads/1/3/0/9/130969137/jidorutoguvonaxoka.pdfIn PDF document text
    • https://dapobatajixafaw.weebly.com/uploads/1/3/4/3/134310280/6192318.pdfIn PDF document text
    • https://rixadoliwuri.weebly.com/uploads/1/3/1/4/131437780/zotozufinib_zenawibexavawe_vejuwo_duzov.pdfIn PDF document text
    • https://narobukedezupe.weebly.com/uploads/1/3/0/7/130738621/8683971.pdfIn PDF document text
    • https://rifitozimolumi.weebly.com/uploads/1/3/4/6/134667823/f24659403716ac6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500444/normal_5ffea442d8697.pdfIn PDF document text
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/bovuzoperetesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489407/normal_6054ce81ddba1.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/f7976468-b756-452f-a06f-2821128e5fef/gakowitelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6c5c5bc-e135-479f-9dce-44b595dfaf7d/2017_jeep_cherokee_service_shifter_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e1ebe27-27e8-455d-b7fc-fa77321bb6ab/d_and_d_5e_player_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dafe7f1c-5db2-4a20-a079-b92ff3fdcd1e/sugufatuwafinudafavajap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29efb150-db73-447b-8c60-2ae69d16ddfb/jevuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/021b8264-4fae-4226-ae57-e0f1b477189f/84994027144.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_off000102c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C6 5456 bytes
SHA-256: 5e888a1988aafe8ddf2684a646ec4140ed72cac1b9e0c0d007b59dc4a15ee227
font_01_sfnt_off0001153c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 10776 bytes
SHA-256: 2cf0d40a2b49e16d8056d24c29b2567f6b54a6886c8e06efa72abe2e530214f4