Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b0d64e93edb612…

MALICIOUS

PDF

80.8 KB Created: 2021-05-10 23:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5838a9670d60e69ccf382c9c118de3f8 SHA-1: 558b73c9ede3aaca2d98243f6c8a4f48d889826d SHA-256: 71b0d64e93edb6125d5ea53423980bb6ee18c62d99306d9f9c5e26abed949af5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://pelibifir.ru/strik?utm_term=are+titanium+drill+bits+better PDF link annotation
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/c0d2737244ef58e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412394/normal_6069d1a5d3a4a.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/bmhegdW/81594801286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471092/normal_606db66ace411.pdfIn PDF document text
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/a668ad.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/ie4Zvgc/gevaxerififibid.pdfIn PDF document text
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/6713301.pdfIn PDF document text
    • https://cdn.sqhk.co/reromiwo/eDE9hhx/free_music_songs_app.pdfIn PDF document text
    • https://jedewudozoj.weebly.com/uploads/1/3/0/7/130739070/kavepupemotita_bagowogovezepo_godej.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/tinepumirefi.pdfIn PDF document text
    • https://cdn.sqhk.co/mopewedote/rfhghaT/giwididutuvukosumagox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491965/normal_5fd9c8513b79b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_1fa3b319be454d6b805c3626bc7fb7ed.pdf?index=trueIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_8a9b00268dd446048abf29d00d4d5a95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f12c24b-9536-4448-aa67-e9d18f897bc0/fetelerixewasevuku.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_31149341dfbe4c0f8e8b429a9bfea5c0.pdf?index=trueIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_cc620ebc20b347bab59a7fed6482877e.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_3689c419c05d4f54893bf25bb2f67925.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d2c818-a639-45fa-9e5d-18242481e198/song_of_solomon_chapter_12_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808b5f71-f98b-45df-8841-334b14024ead/33002848593.pdfIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_dba12c263e804095a1098aef7ddb9ebe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0defe55a-b9a1-425e-acbf-5e5aa509f0d9/74539275179.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_d0574306c1cc443386307349cb6307fd.pdf?index=trueIn PDF document text
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_fa25d057e0074af39980835527e8b5a2.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_24214b709f274c9ea05ae64baee23a72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c696e3db-e6dd-4222-a372-6d80509cc9a1/8784917419.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_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 5100 bytes
SHA-256: d070d9e83a0f939a81800f590e36d6f75c0af187c518e79ba09e2c2ccbb12cd3
font_01_sfnt_off00010ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED4 11684 bytes
SHA-256: d233839786dc4e20a9f53a793818933deda97667b2cdae0891211b7c214231b7

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