Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07715773d929ff4…

MALICIOUS

PDF

76.7 KB Created: 2021-04-20 17:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ca025a75f6357ce883dad63ca9bbe236 SHA-1: 5e75363c992a75e06c197ba53642af7c16d35585 SHA-256: f07715773d929ff47557c5114f501e0d3122e0c7b46d90eb75ed07178c9007ad
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and is flagged by heuristics as a link farm and potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

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://bologen.ru/strik?utm_term=chick+fil+a+nutrition+facts+grilled+chicken+sandwich PDF link annotation
    • https://cdn.sqhk.co/dejegekonula/5QTgdkr/96882927350.pdfIn PDF document text
    • http://xonigej.mypressonline.com/reasoning_ability_tricks.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/wicMjc6/meribakibifem.pdfIn PDF document text
    • http://xufonewujisos.scienceontheweb.net/63102037473.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/wuvixatibuwixu.pdfIn PDF document text
    • http://mujudesuxiropa.sportsontheweb.net/how_much_is_an_oil_change_for_a_bmw_328i.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/64284383070.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/ihXKjfK/32177177126.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/b0lQWgg/21418044591.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_f9552de4d8884e7bb1262bf7b3d00f31.pdf?index=trueIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_7a50ad11efc14c5592007a6bf88dc9e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fd1cbd5-3222-475c-8286-2bc8b6c5f5b2/what_is_the_final_step_in_developing_a_safety_inspection_checklist.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_72b80920c9024f3998696fae9b35b1bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56acc0d5-2aa8-4660-a25d-25e55c7a921a/jesamuwoto.pdfIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_6c97b9b1a9944bc98dd16abb10c93297.pdf?index=trueIn PDF document text
    • http://paguxesij.myartsonline.com/adenitis_cervical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be8ae44d-7b0c-4cee-9fe1-fba4b3af4259/how_to_remove_hampton_bay_bathroom_fan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/408decd2-2538-4746-9ba2-354ade62abdd/lowutu.pdfIn PDF document text
    • http://gafijid.atwebpages.com/aleister_crowley_tarot_book.pdfIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_97af26d81964491da6f7dd78191ced25.pdf?index=trueIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_22bf6b46a33b4508981eeef4e939e092.pdf?index=trueIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_47020f8c5b344c5a86fb19c60e55e4f6.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 5344 bytes
SHA-256: 018c369ceeb52bf6420f2fc1f015805132e5fd4d019e2d60a588a7363cb0a767
font_01_sfnt_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 11476 bytes
SHA-256: 2ad4c715c8067668ce42d745060cf6278c90f73713eab35640f09fa110d04b53