Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af6e0f83646c65e…

MALICIOUS

PDF

80.9 KB Created: 2021-03-13 16:56:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7319a58eb7ea5b3e967563e492da92ed SHA-1: 3efc357aab475d71c0a0f38433ea210d161d7c0a SHA-256: 0af6e0f83646c65ec801b6dee9e59d96ca80b2500cf9b7e7039f41d1d9089847
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external links, with one identified as a potential redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive content and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://golowaki.ru/123?utm_term=budget+planning+templates+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386837/normal_60461d357d361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410016/normal_6022a2f2c74b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474176/normal_5fe424677e9ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_604a758ecd03c.pdfIn PDF document text
    • http://zugawumaz.22web.org/what_losing_yourself_means.pdfIn PDF document text
    • http://visebadegu.iblogger.org/arduino_mega_2560_r3_pinout_diagram.pdfIn PDF document text
    • http://pozuwigazabo.22web.org/12816508362.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://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_2a074454120a4aeabc2d3cd9f63149d5.pdf?index=trueIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_4643fa0fe1b34ae4ba96f6d3d1930c9d.pdf?index=trueIn PDF document text
    • http://karuriletepet.epizy.com/what_is_the_song_id_for_7_years.pdfIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_34a1f54509bd456293ac590677d49a43.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcc4882d-859d-40da-8464-03aaf61aeea8/nuvowasobuwuzino.pdfIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_4d7b2ca0f8ae4782a2c1d3e049ea36b9.pdf?index=trueIn PDF document text
    • http://nowesiredud.epizy.com/wavaxu.pdfIn PDF document text
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_0c8f77118c8d49188edc5f82cb7609d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6420c7e5-af81-4898-b901-3ba6bc78aa6d/91692964788.pdfIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_e8390d13799d47aabe280b78b5fd18c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9295b33b-697e-48ab-886a-b0c8c920ab7a/what_gym_equipment_is_best_for_beginners.pdfIn PDF document text
    • http://wafubarig.epizy.com/61184106929.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_fa369361b0e4435887a4292006b5c2c1.pdf?index=trueIn PDF document text
    • http://webimonok.epizy.com/46209999840.pdfIn PDF document text
    • http://nugafafekovad.epizy.com/24267959683.pdfIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_fa4d2f8e086e41dc9b6093a3f58e271a.pdf?index=trueIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_f13e37cc67a943d6834a460be7c973d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b2435df-a497-432f-8b65-d5b17de97e0a/mezufopobizivigawe.pdfIn PDF document text
    • http://dogirajuwuxo.epizy.com/56081056052.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_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 5180 bytes
SHA-256: ff65fdab74edc9313f575f50becb917bee9d0bc9980e31c7bb7b9a1f24aa3251
font_01_sfnt_off00010089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10089 10864 bytes
SHA-256: e628a566d0b5cb807819dd0039d70099df0d9ecacc526c857e302fb3180a76d3
font_02_sfnt_off00012575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12575 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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