Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cf0bc5fb4ae60c…

MALICIOUS

PDF

76.9 KB Created: 2021-03-20 03:33:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4f516148cb60829f53786bf45e97cb86 SHA-1: 2d804c2679c9cdf9fa2d11309507510f5da43739 SHA-256: 93cf0bc5fb4ae60cd4b617a20ad6c237ac408ff4dc1e0b0daeb2327dd1dd35d1
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external URLs, including one that appears to be a lure for a movie download. The PDF_SEO_LINK_FARM heuristic indicates a high volume of links, suggesting an attempt to drive traffic or distribute further malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm structure strongly suggest a phishing or malware distribution vector.

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/123?utm_term=old+jaani+dushman+movie++hd PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4483075/normal_5fd093e856252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384835/normal_6052ed4ee236d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_6024a91f18ad7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fe72efa2be65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_604dc062a2520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384634/normal_60439219e4db6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457296/normal_5fe0008d82cdc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_8fabd5c2e50944a08e799c8a436aa2f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3360a6a5-51cf-46b9-b1a4-4cd856db06e1/25249529213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/290407ab-bc59-4d85-ab0a-748a24d258c0/quote_with_friends_like_these_who_needs_enemies.pdfIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_28c8e2977f9049639d23be60978ba64c.pdf?index=trueIn PDF document text
    • https://8df9d1b7-8f6e-49e1-bdac-c9da4d4291fd.filesusr.com/ugd/12c198_b33d33bf01424f3694922e9cbaa42830.pdf?index=trueIn PDF document text
    • https://3d636ecf-b5c4-4691-845c-2d501a7a8090.filesusr.com/ugd/b09df1_a63f51fa6f8d4559b486141e9d04a6cd.pdf?index=trueIn PDF document text
    • https://1b3e2d6a-0348-4772-9bb2-16e56a761455.filesusr.com/ugd/7bcf02_49bc2bd972264a67903a91852f745c1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/421a13bf-dca0-4e55-893b-eafa703e22e4/46193970112.pdfIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_c578d29ac35642ad86dba19d3dd6946c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f1beb7a-9e89-4e7c-80e7-8c8bb46c219e/87064270111.pdfIn PDF document text
    • https://b6de9e3f-c562-4e05-b5ee-70895c8060ae.filesusr.com/ugd/3801ff_3a76176e82cf4274804ed0b2116ca209.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/af218915-8e7f-4fb3-9c52-1833e63a31da/entry_level_information_systems_analyst_salary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f92f83-a62e-4507-bf12-cee6946aa5e5/how_long_should_i_warm_up_before_weight_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8ec187-9cbc-4b73-a761-e0b178650890/axiom_25_driver_mac_download.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_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 5132 bytes
SHA-256: 8d2da5d753519e0e6ee0948c78f5d59a5defef74510d145ac84c497045f88e29
font_01_sfnt_off0000f683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF683 2188 bytes
SHA-256: 340b7d9bf4cef1933f06564a3b4bdedb18dfabf60f93382df505a47e23618af4
font_02_sfnt_off0001004d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 11008 bytes
SHA-256: bde83d36ddd40827b89b01c7d69e81a44ff92971b539aa65e11c469c17802aa9

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