Malicious PDF — malware analysis report

Static analysis result for SHA-256 db93554f031f5d3e…

MALICIOUS

PDF

169.6 KB Created: 2021-03-05 11:35:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b27d8efb048cc00bf04ef6153dd480c2 SHA-1: a150fc65ee0f39af52c8752b5559430a17cb8124 SHA-256: db93554f031f5d3e22eb8d6b0d5a1e5a81cb165ee2c786577d25afd4bbb41401
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of an embedded URL suggest the document's primary purpose is to redirect users to external, potentially malicious websites. The 'SE_INVOICE_LURE' heuristic further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pelibifir.ru/123?utm_term=omb+a-87+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382638/normal_6005fa98f1f24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445541/normal_6028e8377b28c.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/3094e0c6-b3cf-477c-88c2-ed66e6964639/jupikamunezumuwa.pdfIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_2dabfb8275dd40b98b5f27921ce9ebc9.pdf?index=trueIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_39c9dada5c3e469c905b4d852f04a3c8.pdf?index=trueIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_cc413466d3a345d7a31ff9c21497b54f.pdf?index=trueIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_d9af72f9709a4a21a4d33e6f1833c5aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d766d3b-cb37-46de-be27-7632031f7713/nezebu.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_fabc83cd09b94b68aa59ccf9594fcc69.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_a0dcd973e49b4e3b9514e4af8362e7d6.pdf?index=trueIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_3e93b40052fb41dab1db27a4ed954d24.pdf?index=trueIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_e29baad6e2244d2db1c052bd33dcd44f.pdf?index=trueIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_a270380738c64478829e3ad9df1deb4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98ec3717-4574-4178-8a04-c73d1f53c850/water_is_wide_meaning.pdfIn PDF document text
    • https://201a0bc5-0eb3-4135-8969-828875a6b07d.filesusr.com/ugd/607883_b0326b3c065847b4b5d76dea3650e6ce.pdf?index=trueIn 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_off0002611b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2611B 5352 bytes
SHA-256: 1a32ef85972e3236483b6b8e3b7f722f551676b0699b399cdec6234b9fbd185e
font_01_sfnt_off00027349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27349 11088 bytes
SHA-256: 271bf35384815632dbe063c81de5c5eb6d4a9d27dd879f15055faabc548241ae

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