Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f0eff74539419d…

MALICIOUS

PDF

44.9 KB Created: 2020-11-09 15:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5fa7e0a4cb3842b339056c24b4cae614 SHA-1: d7a46961280353e29a4a6f3483e67f5ee4b83ee4 SHA-256: 10f0eff74539419d33b6da59fa8c28ff6d47c5b479de922f76bfa792d5a6db14
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious or spam content, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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?keyword=ugolino+golf+club PDF link annotation
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/tojajosoripadin_koniwixowabafa_lodod_dakesukexevime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422145/normal_5f984c47df373.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393369/normal_5f998ff14f353.pdfIn PDF document text
    • https://pavofadibap.weebly.com/uploads/1/3/4/3/134370944/zogedufolosefe.pdfIn PDF document text
    • https://fujimerikav.weebly.com/uploads/1/3/4/3/134307110/komivu.pdfIn PDF document text
    • https://misikeni.weebly.com/uploads/1/3/4/3/134336029/womatiri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380072/normal_5f9284b416802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5f8a1c4e8c335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381788/normal_5f9253a3bcfcb.pdfIn PDF document text
    • https://nibobesexetew.weebly.com/uploads/1/3/4/2/134266191/wafezizoxox.pdfIn PDF document text
    • https://rajerese.weebly.com/uploads/1/3/4/3/134387708/4ce8191f6905.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/wotareropajewub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b5c61dae-f7d1-4586-9ca5-4c246c727b59/61644658474.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/semosufojof.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/tearoom_trade_study_violation_of.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67ED 4380 bytes
SHA-256: 74d6d19f36b14b3a4c828595950745135fcd4edb2edbc79fff669ab4ee6e03b8
font_01_sfnt_off000076de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76DE 9776 bytes
SHA-256: 0b4faef27cda5bdc1c0e1603151c1be6b4e910ca756fa2eb65fc10d478e10c3f
font_02_sfnt_off0000983c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x983C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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