Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1f47088b24b596…

MALICIOUS

PDF

101.1 KB Created: 2021-03-28 13:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 79c457f9d86af8e8a55b14be0b03846b SHA-1: e2206b37fbf5e217d1a93ba4c9c172baa5c4f825 SHA-256: fa1f47088b24b596068805c1475d24264bef1c152e963840fcffb4d6cb3e109b
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous external URLs, with a primary suspicious URL being https://dugedepap.ru/strik. This suggests the document's purpose is to redirect users to potentially harmful sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://dugedepap.ru/strik?utm_term=tom+stoppard+arcadia+themes PDF link annotation
    • http://ek-arenda.ru/dvdms_portal_biharcqutp.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/g5Sjajg/71003021666.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/JJeja4z/91124073831.pdfIn PDF document text
    • http://axecheat9.xyz/focus_on_ielts_foundation_answer_keywcz82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_603a05be6c08b.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/TGsii6z/89103242174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_601924254e1be.pdfIn PDF document text
    • http://power-guard.shop/brother_dcp7065dn_pricem4201.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://damita.fun/american_history_1400_to_1800e0xjc.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/Icqjagc/road_riot_hack_android_apk_free_download.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://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_2cd2e4cf76ae448d985230a1c88e40d4.pdf?index=trueIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_1557e3983b2342f0b6a0031197ae92ce.pdf?index=trueIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_ee8a8f6921104311aafb08d812b68e96.pdf?index=trueIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_fc4bf30e9a2542238d6ccc0ea43096e6.pdf?index=trueIn PDF document text
    • https://877305ac-a74e-4e93-918f-f866ec7622df.filesusr.com/ugd/0dac30_7d4fb745f6b1496682fe600d7b151df8.pdf?index=trueIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_fdddb423cd044e55a36c30b2c39d0eb4.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_de7dd9f418524da68289d3b326540e21.pdf?index=trueIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_65112daf077a4dee93dcd5aa85b75f78.pdf?index=trueIn PDF document text
    • https://db244590-af71-4c33-bd6e-2f8f55f31281.filesusr.com/ugd/fdab61_667ae86e12804110a783846701c0ce5f.pdf?index=trueIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_879814c5b5c6480888620f5d5c0a9b34.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001426c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426C 4912 bytes
SHA-256: aefcb80fea40eb7f51c8d35a5c1d4927744ef8023aba6776e9699d70d659b4eb
font_01_sfnt_off00015316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15316 11272 bytes
SHA-256: 6888975be3e9dfc19ec4fc8825e4449af046bc95cd4a289c71ff2c50fbe4fa7e
font_02_sfnt_off0001790c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1790C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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