Malicious PDF — malware analysis report

Static analysis result for SHA-256 43703d98df9e2242…

MALICIOUS

PDF

74.9 KB Created: 2021-03-21 12:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f257c3ca0fbbb0d6791acce21766a77c SHA-1: 192c013f99290bc81aeac9f629f7fe1775b3c6f4 SHA-256: 43703d98df9e2242c5547c6da7a261124624614c5f1de4ad77f18fdbf3d90612
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://lozipotod.ru/wix?keyword=sichuan+pavilion+dc+closed PDF link annotation
    • https://werikaduf.weebly.com/uploads/1/3/4/4/134483952/593af12c94.pdfIn PDF document text
    • https://valojeruxul.weebly.com/uploads/1/3/4/6/134681631/071a7956d5f280.pdfIn PDF document text
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/vilil.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/how_to_start_subaru_ea190v_pressure_washer.pdfIn PDF document text
    • http://pejazadajenatew.getenjoyment.net/list_three_adaptive_features_of_hydrophytes.pdfIn PDF document text
    • https://giromazipudu.weebly.com/uploads/1/3/1/4/131453901/fupuxesarevo-gidepix.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/27126d3d-da02-48cb-b892-2b91aed3fa71/1114472691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24a52f67-1e44-4d39-b8f9-858063803dd0/why_is_my_ac_not_cooling_properly.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/chronicles_of_darkness_dice_roller.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/can_i_use_imovie_on_macbook_air.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65985a9e-a38b-4630-9dea-085e88b6feea/2012_hyundai_sonata_limited_sedan_4d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f470f753-9208-4fd0-99f9-8bb1d0f670ec/nuverutobonupaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b767cd2-566a-4177-bba1-037ed3108000/64166261941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1eea7cb-6286-4e3f-a133-aa662dd27263/walmart_pharmacy_hours_omaha_nebraska.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/tuvajewab.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/puzasulezesoxitu.pdfIn PDF document text
    • http://vomewudige.atwebpages.com/pediatric_ccrn_review.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/travel_guide_definition_in_spanish.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_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 5228 bytes
SHA-256: 3e76c1f3fa42838eeb7a34c05043f149a6d904def63fb152a80a9815545f0315
font_01_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 10812 bytes
SHA-256: a0894c15e1ddd0062714e146484ab5f95104f34db388cdd428b101f6121175f8