Malicious PDF — malware analysis report

Static analysis result for SHA-256 83aba82a737dd9b8…

MALICIOUS

PDF

112.5 KB Created: 2021-03-29 06:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03a9cd64c8f2399b9c214d2ac01323ea SHA-1: 79e3c3dd3dc0b7b8a0c485416a798f5dc404ab2d SHA-256: 83aba82a737dd9b8d1d549f51e8c4c4f586334e0b8f4519eb6953071695df295
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, many of which are likely part of a link farm. The embedded URL points to a suspicious domain, suggesting an attempt to redirect users to a malicious site. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it's designed to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/strik?utm_term=pentair+sta-rite+pump+manual
    • https://static.s123-cdn-static.com/uploads/4417309/normal_5ff39d315e552.pdf
    • https://povebosi.weebly.com/uploads/1/3/5/3/135346093/3962196.pdf
    • http://sirofopunisatus.iblogger.org/football_game_information_in_english_for_project.pdf
    • https://static.s123-cdn-static.com/uploads/4426072/normal_6001e7280d80f.pdf
    • https://paruvinuj.weebly.com/uploads/1/3/5/9/135970142/6359354.pdf
    • https://cdn-cms.f-static.net/uploads/4501645/normal_60478506e8c97.pdf
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/b9de776.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cbafc699-6494-46da-becf-3b9e58700fec/how_to_get_a_management_consulting_jobs_in_uk.pdf
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_cab13f1dfd5d41aaaa561ac599b2b727.pdf?index=true
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_c8b4539b293f4e39bc62c9b215947320.pdf?index=true
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_643996a2306148d7a27891c1ee38a7a8.pdf?index=true
    • http://vodulisus.rf.gd/after_20_years_o_henry.pdf
    • https://uploads.strikinglycdn.com/files/7b3449d2-c9ab-48bb-adea-dddaee427996/gasoxeva.pdf
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_7b8213e8fdd946478013fc77c35873a4.pdf?index=true
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_2ec96fc564084348902597ef21ee4246.pdf?index=true
    • http://fafaxuz.epizy.com/34596061306.pdf
    • https://96ea5dd8-6962-4d57-b29c-fb233a715e3b.filesusr.com/ugd/ac3463_106f563b1b7b44639bc750a947c28b3c.pdf?index=true
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_ca68dcd03a9c4ec4a200f0e4ce16ea9a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d0cfac16-8acc-4c51-8f96-fc394fdaae72/cuanto_es_7_gramos_de_cafe_en_cucharadas.pdf
    • https://uploads.strikinglycdn.com/files/eb097df7-6f33-451a-974c-8c72be153ab4/stand_by_me_ukulele_tutorial_easy.pdf
    • http://gobonelore.epizy.com/fijusunekumelera.pdf
    • https://uploads.strikinglycdn.com/files/58d7a93d-447f-4172-9694-1f04185771ec/52756091935.pdf
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_a6c8adb4c456411ead4eae9eebeedf49.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153d3.bin
9ee617c821d58398643afe4d7d3aaa3fe9255968ddde598a314bb3d71b437aa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153D3 4996 bytes
font_01_sfnt_off000164be.bin
abdc10a3454d2c27a3477b95860b44766808660b84742c5e83f53e503e6bfeb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164BE 33392 bytes

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