Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc12182f8d3e092…

MALICIOUS

PDF

79.8 KB Created: 2021-04-21 12:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d2a3627d79d7ef9dd1c3889b91ea6c41 SHA-1: 6c1c2fd5679153cce6fd1c48353b7b3529860fdc SHA-256: 7bc12182f8d3e09253a7eb7bac5b06217cf4ab3789772fcba5c64046fd6e722b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it contains malicious content. It functions as a link farm, with numerous external URLs embedded within it, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful sites. The presence of multiple external links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=what+causes+a+refrigerator+fan+to+stop+working PDF link annotation
    • https://tejelodaburibav.weebly.com/uploads/1/3/4/3/134317360/5682865.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/bee0c0603878.pdfIn PDF document text
    • https://cdn.sqhk.co/sapasimemo/hgjcV43/jenuzab.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/hmdgjsf/ganabegefesemivutonufo.pdfIn PDF document text
    • https://cdn.sqhk.co/wokiwife/jaiiggi/hair_salons_open_in_california_covid.pdfIn PDF document text
    • http://jedupemomaw.22web.org/gujera.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/xitikuna.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwagezo/hb9zHhh/broken_heart_hd_photos.pdfIn PDF document text
    • https://guretaximijogu.weebly.com/uploads/1/3/0/7/130739376/033e8fec7cdf2.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/aRnTm7i/52208490905.pdfIn PDF document text
    • http://jeweboz.iblogger.org/it_security_cheat_sheet.pdfIn PDF document text
    • https://rawewarox.weebly.com/uploads/1/3/1/3/131379085/vadelivibuxof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c543ceb-7fe9-4556-8aad-28708d4bfade/the_chrysalids_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efbfcd66-aaf1-4d53-bd2c-308be5803880/mabikisufotewuxotufu.pdfIn PDF document text
    • http://kuzotekekejepun.rf.gd/80870577249.pdfIn PDF document text
    • http://sedufutubuge.epizy.com/45435805939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1886fa88-be4d-43fb-a6b1-6213976f8b29/8843967877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52db4713-7c82-49a6-b543-1954a8fa319e/53187584612.pdfIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_5e579237edef4aa0aa53895727bd7042.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e865a7f9-cd1b-4cf4-9c9d-a1698ee1d22b/44438761534.pdfIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_375f657a1d6d4034bc38e85b5138fb09.pdf?index=trueIn PDF document text
    • https://b6d28218-96ba-4f98-b9c1-0d78b4e6fe84.filesusr.com/ugd/47aa88_bbf54d3edd48498c9d88f05655d77385.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/173a29f4-dcda-410b-a7ac-b88c5f83f135/sc_dmv_locations_open_on_saturday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/064137f3-6f90-4a33-8bd4-89ce3b726fde/pillars_of_the_earth_tv_show_review.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_off0000fa19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA19 5416 bytes
SHA-256: c707b3aa197d22ba45159b1a408b5515e87c349a94e37dd4c61c9f32abf0466d
font_01_sfnt_off00010c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9C 10808 bytes
SHA-256: 7815fec11f1f7dc998e06dcca56a6b48fc2953ade882d37396198fedbad71445