Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7cfa22dbfc12fe7…

MALICIOUS

PDF

73.8 KB Created: 2021-04-19 15:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 135695a753dae251f163ca2f94541bcf SHA-1: b18fb097d419777797f40270fca5906fa545d966 SHA-256: f7cfa22dbfc12fe7ca9c14a115b670d567b97c349f068731b4c1086c0ac68e37
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://xajibur.ru/strik?utm_term=physics+electric+circuits+quizlet PDF link annotation
    • http://piredvizhnik.com/Iowa_ile_meth_yapmaxpfye.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/problematicas_educativas_en_colombia.pdfIn PDF document text
    • http://bloodcraft.online/fezizidxozka.pdfIn PDF document text
    • http://podeves.xyz/3776782152agtjd.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • http://fb-ig-copyright.com/lethal_race_hacked_gameogkwr.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/woBrNji/fireman_sam_helicopter_coloring_page.pdfIn PDF document text
    • http://netlysy.online/givilozezu0n8i1.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/76393076060.pdfIn PDF document text
    • http://fosavaxenu.mypressonline.com/48127520430.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_2fce7f04d98642bab02435ac57287c73.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92be5051-5367-4a6d-85b4-84227b65dcbc/92554027604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb0063e-d5c8-438a-923c-3b891957b498/bow_tie_pasta_with_spinach_and_sausage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b579de20-339d-4f6a-9f64-80a1f5ca1968/zitadimopav.pdfIn PDF document text
    • http://forojiwimudobo.atwebpages.com/pigivetipifakuxozikul.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/teaching_aptitude_questions_with_answers_download.pdfIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_5dd3d525c2f74a20884bf82a907fead2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d6c58f-0c0c-409a-a723-cc3f8ff43ed2/dometic_8500_awning_fabric_replacement_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13395f86-56ae-4d09-9326-5f5bbb0d8344/que_beneficios_tiene_la_cebada_para_los_bebes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39765e07-9ebd-4572-92c5-645c22ffee97/what_is_grantor_and_grantee_in_real_estate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50bc6ffc-027b-42cc-823f-12d282d1b917/susirewoxoluluto.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_ff8ae47ba0f24f29a5fb6bc0b0a6afd1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22bac672-32a0-48e3-8f8e-2c79dd513e89/health_and_safety_policy_for_construction_company.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 4620 bytes
SHA-256: 79d3b7f10cb72127d25139629a97a3c2ee489b94193c123142a36f3bbb9e6512
font_01_sfnt_off0000e722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE722 10708 bytes
SHA-256: d1060227ae59c47cd603fb2468bb1dcc6d8e6dda74be757691f1da30304dd7d1
font_02_sfnt_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176