Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec0cd04b7ca41655…

MALICIOUS

PDF

84.2 KB Created: 2021-03-20 04:15:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e49d1e3da2cef0ffeb2be1ebcf4f93ad SHA-1: b6c73eed0a3bfe856103f3dcb31e551c32d78f02 SHA-256: ec0cd04b7ca4165598e4dd55b2749c29dfc8701d400ac43e3141536357000753
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary IOC is the external URL `https://golowaki.ru/award?keyword=classification+of+air+conditioning+system+pdf` which is part of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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/award?keyword=classification+of+air+conditioning+system+pdf PDF link annotation
    • http://retys.space/114904990830ae04.pdfIn PDF document text
    • https://xadupokunarufi.weebly.com/uploads/1/3/2/7/132710624/loboxefodowe.pdfIn PDF document text
    • http://begemotiks.fun/bike_wheel_size_age_guidexru7z.pdfIn PDF document text
    • https://zitadinenere.weebly.com/uploads/1/3/1/8/131871439/wagifoxilixow.pdfIn PDF document text
    • https://xixebume.weebly.com/uploads/1/3/0/9/130969831/lidemotubu-kiverikoxobuzo-jaxutute.pdfIn PDF document text
    • https://pemugaladesav.weebly.com/uploads/1/3/5/3/135307247/peturexolawu_petudopakeseko_rikedurerano.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://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_fb4361fac57b46ef9256ba015ddd985d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ad1aca-99cf-469a-abff-0201ca50f44c/how_to_adjust_carb_on_husqvarna_460_rancher.pdfIn PDF document text
    • http://nulabede.epizy.com/fuxopeburu.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_b8bec62da42a4a529e3c4e8fb21159d4.pdf?index=trueIn PDF document text
    • http://majuzudotalu.epizy.com/56757790170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d46e30f2-d1cc-42c5-8b96-16dfd27c372c/washing_machine_parts_around_me.pdfIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_91233563c94a4becb6028b309b65d320.pdf?index=trueIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_fc3a79ea8c854e2cace7bc4c2fac09fc.pdf?index=trueIn PDF document text
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_335bc89e85a7429894bdbaa32691939b.pdf?index=trueIn PDF document text
    • http://zenomidesedi.rf.gd/which_family_feud_host_killed_himself.pdfIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_9f26da5b0d6d42edaca37d21d554ff6f.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_c0a275609c1d4f47aab68683ac9bf5fd.pdf?index=trueIn PDF document text
    • http://xivifusa.rf.gd/what_are_the_responsibilities_of_a_covid_19_compliance_officer.pdfIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_26bfe8e2ee7a4c96b58dc36c577d23eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e8a0a9b-458d-462e-9129-ddf86a4b18a2/62195964545.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_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 5388 bytes
SHA-256: 1ce4bf222192aef5bcf466f8a3195f110a68da7fc8e83da19f3ce46b743bd9ef
font_01_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 10852 bytes
SHA-256: d314ab5e03883f8178064fe11764fff527c58da79a8486687d0792a356ba250e
font_02_sfnt_off000134fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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