Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7bc0bd31f517cc0…

MALICIOUS

PDF

80.8 KB Created: 2021-03-27 17:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 824c3e0d327b9310cfa1626af2cf45af SHA-1: 0834780f88b26a2a329ce36b624c066eabd26509 SHA-256: e7bc0bd31f517cc06eb5ea5c00293fe213f91ec7676a59d5a3578ae19d627391
126 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 services, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains keywords like 'bailment cases pdf' and metadata indicating it was generated by wkhtmltopdf, reinforcing the idea of a content-generation scheme. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/award?keyword=bailment+cases+pdf PDF link annotation
    • https://zugufanebuloko.weebly.com/uploads/1/3/4/0/134016669/4218501.pdfIn PDF document text
    • https://woniwisupu.weebly.com/uploads/1/3/4/2/134266019/pavusimo.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/jbDnvje/cat_warmer_house.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_600bd2f1b4c5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443610/normal_5ff6b63eab3a2.pdfIn PDF document text
    • https://namonivet.weebly.com/uploads/1/3/4/4/134493383/lidetojija.pdfIn PDF document text
    • https://cdn.sqhk.co/zonakagud/ijhrQgg/25192250736.pdfIn PDF document text
    • https://nosevale.weebly.com/uploads/1/3/2/6/132683459/xekenupabitifatenox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392871/normal_6032244a4ec43.pdfIn PDF document text
    • https://fobibopokigafo.weebly.com/uploads/1/3/4/7/134702456/6003831.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/githgjc/62424554276.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/9ogdY6Y/cplus_for_craigslist_review.pdfIn PDF document text
    • https://cdn.sqhk.co/komagiju/nihV2l4/80s_wallpaper_for_walls.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_0498d13713dc42fe9d6e2dfa1aa549e6.pdf?index=trueIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_3dfe4bb4406d4acf976c5d8e0569532c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8825b906-f159-4ac1-a374-599392ae1ec6/miller_xmt_304_cc_cv_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a57fcb35-17de-4271-9b37-f7fc428b8e10/fizinev.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_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 5256 bytes
SHA-256: d2de92ba67a363aec0ee54d1f9c6b63c99e55302c208fdbdce96992a078ee4a3
font_01_sfnt_off00010ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBB 11212 bytes
SHA-256: 1403c51e86ce8012a20a0348ad884f42184048a5cfe6bd78e5effce2bc18ac3e

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