Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ffbc96683da9f76…

MALICIOUS

PDF

81.8 KB Created: 2021-03-11 04:12:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 61053df0e91b68c27b15c9276dfd13bf SHA-1: cd913f18885db109d5ab278cafc0c451409c5e08 SHA-256: 4ffbc96683da9f768cdaaff7e96cff1aeae0d3c251d0e02e8ff8f3f48f0e7d9b
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to malicious sites. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's content is designed to trick users into believing there are new payment instructions, a common phishing tactic. ClamAV detection further confirms its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://soxebez.ru/strik?utm_term=what+are+some+good+reading+questions PDF link annotation
    • https://vixezikuf.weebly.com/uploads/1/3/1/3/131383943/rulunik_rasig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382779/normal_5fd3ba42cf73c.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/UdDcDjh/39187754188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_601912d7840d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474722/normal_5ffd645d4a3fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403938/normal_5fe298ba4cd13.pdfIn PDF document text
    • https://cdn.sqhk.co/lopijikuvi/h6haijf/quiz_buzzer_circuit_using_relay.pdfIn PDF document text
    • https://ginuwedisifixel.weebly.com/uploads/1/3/4/7/134744372/bevoriz.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/GidhbS8/good_websites_to_learn_spanish_for_free.pdfIn PDF document text
    • https://cdn.sqhk.co/temegolu/JiiUsif/new_water_parks_in_houston_texas.pdfIn PDF document text
    • https://jivenikovo.weebly.com/uploads/1/3/4/3/134308789/1b241bfc537.pdfIn PDF document text
    • https://posokirotol.weebly.com/uploads/1/3/2/8/132814476/9896636.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/5276b003436a.pdfIn PDF document text
    • https://torobekaxiwe.weebly.com/uploads/1/3/1/3/131380482/jilaza_zevafariza_neninugeru.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/6949768c-478e-4901-b0c8-ae0420db40ba/omron_hj-320_pedometer_review.pdfIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_7c16550467844e6b854a87ccc897c059.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a2958e6-fdf0-4219-8172-cc5f6dbac33b/26711405624.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_e42bda69657a4785864e977c2b08e586.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b905fa53-7dc6-4203-ab29-9544345d4898/how_to_write_introduction_for_biology_lab_report.pdfIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_c9949887b47649738ce1c91e4097179b.pdf?index=trueIn PDF document text
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_1d5f6b396c294633b35d07e8674c1129.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/13390ca0-4e68-44cc-92ae-702c3acebc55/how_to_factory_reset_rca_11_galileo_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31961ed-f030-4bd2-9cb3-0b8eeb21e992/what_is_sociology_class_about.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_0498570074694748b754db87d9e42231.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_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 5348 bytes
SHA-256: 3a6a43321b083a1ccca30a58e4be74df997649fdbae9707b3b5b4e7f124dfa20
font_01_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 10976 bytes
SHA-256: 8698eb6ab795eb5bca8541d846ce97303b3139d1027b7bb0de9ca6fe367640ce