Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0fa83d211944d1a…

MALICIOUS

PDF

86.1 KB Created: 2021-01-21 19:49:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a8808e396dbbf86190a36d39b1ed2966 SHA-1: 4421b9ae5d0b3fd32e751a3a49226af90846249b SHA-256: f0fa83d211944d1a79e1c6baa82492e981e81b25f007e8b684fb3b2775369559
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://traffine.ru/123?utm_term=angry+birds+quadratic+project+answer+key+version+4 PDF link annotation
    • https://cdn.sqhk.co/xutazazo/nmGeij8/android_radio_car_stereo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498882/normal_5fe1be192ae35.pdfIn PDF document text
    • https://cdn.sqhk.co/zivugeri/hdPpjbk/snowball_fight_winter_snow_battle_action_games.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/ie6NKig/rocketbook_app_for_chromebook.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453900/normal_60014e0273806.pdfIn PDF document text
    • https://site-1166725.mozfiles.com/files/1166725/dadole.pdfIn PDF document text
    • https://site-1172777.mozfiles.com/files/1172777/chemical_equation_balancer_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379487/normal_5fff2a88bd7a3.pdfIn PDF document text
    • http://dixajadabaw.66ghz.com/16834823464.pdfIn PDF document text
    • https://site-1175852.mozfiles.com/files/1175852/29174283279.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383446/normal_5ff6539701f5f.pdfIn PDF document text
    • https://site-1173833.mozfiles.com/files/1173833/xugapazadugadudasakekev.pdfIn PDF document text
    • https://site-1168133.mozfiles.com/files/1168133/sevaro.pdfIn PDF document text
    • https://site-1195605.mozfiles.com/files/1195605/safety_wear_ltd_60_port_arthur_tx_77642.pdfIn PDF document text
    • https://site-1244760.mozfiles.com/files/1244760/kulog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fibesezati/80196335206.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/jsf_phone_number_format.pdfIn PDF document text
    • http://nolepukopele.epizy.com/tefela.pdfIn PDF document text
    • http://dajidagetulawu.epizy.com/71259041400.pdfIn PDF document text
    • http://diturasenupope.epizy.com/62400909483.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_off00010f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 5944 bytes
SHA-256: 1347ade1eb7fe38d718b117131aaf901bfc69e82990678edfe20c60d6b7bd03d
font_01_sfnt_off000123b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B2 12000 bytes
SHA-256: 69c0039190cb068afe6ec711f000f388e8e2abb3277b4f1dbd16c69f0a2bbbbb