Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c69b23f8af7423…

MALICIOUS

PDF

68.9 KB Created: 2021-03-27 12:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 38a0b86b856ad3f5b5e934a4f2364f40 SHA-1: 72b79da6a06c684b19c04de4ed1531215667285a SHA-256: a7c69b23f8af74236422e6c3abdb8e125ea50139d7a9d87884173212987722f2
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, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware sites. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious redirection tactics.

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://seumenha.ru/strik?utm_term=how+to+calculate+half+life+in+pharmacology PDF link annotation
    • https://worubagazew.weebly.com/uploads/1/3/4/6/134639575/2905209.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/baxudejubebuz-fisaroja-pupepup-panumegase.pdfIn PDF document text
    • https://xolovimuwoza.weebly.com/uploads/1/3/4/8/134865524/takugagapokonir.pdfIn PDF document text
    • http://zabotokuke.iblogger.org/88714890819.pdfIn PDF document text
    • http://tikutajufa.22web.org/14352354029.pdfIn PDF document text
    • http://werisafijorarit.iblogger.org/english_grammar_in_urdu.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/306dbb78-96ca-44c0-aa1f-e9b9961c172f/sv650_repair_manual.pdfIn PDF document text
    • https://89e1056b-8c01-44a4-bea5-a80a497d444f.filesusr.com/ugd/6db6f7_12b8874381524d48b2dc45b7f391d668.pdf?index=trueIn PDF document text
    • http://zekovulelopur.epizy.com/benign_skin_tumor.pdfIn PDF document text
    • http://kilisajafe.rf.gd/stanley_wet_dry_vac_replacement_bags.pdfIn PDF document text
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_6048c42f3ac54531aef76fda432df996.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb57a5a-2c2c-4f25-a6e1-e25c3b8aa2ee/77777810925.pdfIn PDF document text
    • http://zilemugas.epizy.com/ap_us_history_textbook_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d02fc9-6725-4727-9633-b811965828b8/92200092024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c06c14-ab35-4188-9c28-8c7b613a7f46/wabozitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f79e165f-fd4a-4984-8e87-a4d465789844/logitech_z506_5.1_pc_speakers_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e28c50c-0baa-43e1-a5cd-e41361568afc/9012154011.pdfIn PDF document text
    • http://befatig.epizy.com/libilaruwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/217e5329-7710-4994-99bd-369a6929ade8/56549979599.pdfIn PDF document text
    • http://tidefos.epizy.com/66841469126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae4bbabf-6036-4f0a-a686-6ae82d2ca8b8/krugmans_economics_for_ap_second_edition_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2b933b4-da96-4fa1-853e-d7e902514bd4/kimidetukoju.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_off0000d0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F8 5404 bytes
SHA-256: de6f9bfefa5cc6f10916581653d2625d84f9d0dcf75387aeac80b98905fd53cd
font_01_sfnt_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 10192 bytes
SHA-256: 5d9b21a4e3d3d7c0f50c6ccbdff1ddbdcaa7d80ea89ff4db4f9803576861f44a