Malicious PDF — malware analysis report

Static analysis result for SHA-256 de28f8955723978e…

MALICIOUS

PDF

84.5 KB Created: 2021-03-07 20:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: bf990f665cbea2cb3381d7c3b4e8e5ac SHA-1: de3e24692ed91e42479752660512b1898c30edbf SHA-256: de28f8955723978e1197ca86b5837c074635df3cdae710165efb627e772bc44a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The heuristic PDF_SEO_LINK_FARM indicates a large number of outbound links, and one of the primary URLs points to a domain associated with malicious activity. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://fokemale.ru/strik?utm_term=what+are+the+five+senses+called PDF link annotation
    • https://wiraxupafetob.weebly.com/uploads/1/3/2/6/132696263/2083517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_5fe8ca4cf04f5.pdfIn PDF document text
    • http://chuvashovfamily.ru/missiles_of_october_dvd7abeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484633/normal_5ff2d8004db0a.pdfIn PDF document text
    • https://veduwasa.weebly.com/uploads/1/3/1/6/131637496/sagib-nofezuxatiluwu-xozuveror.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413696/normal_602cfd3f338b6.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/iaicjdE/46295765572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495974/normal_603954382dc47.pdfIn PDF document text
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/ziludomig.pdfIn PDF document text
    • http://vertigoa.online/6935633120siwnk.pdfIn PDF document text
    • http://whysmall.space/simple_business_plan_format5lumm.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/gjjglRV/25363299560.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://s3.amazonaws.com/jijumupade/abkhazia_tourism_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/fobomijanuzuzedif.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/arabic_keyboard_for_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b6ae0ac-90ea-4c6b-ae84-e8c33258ee77/renupodojitamoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66fe140e-a050-486a-a04e-639f4c0c5d50/navien_ncb_error_code_351.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/bob_revolution_se_double_jogging_stroller.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/a_christmas_carol_play_script_for_high_school.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_off000100a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 4860 bytes
SHA-256: d604f6ba315ed17d3a5c78a052032f280536c1083b1facaa57084d03f7132b07
font_01_sfnt_off00011127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11127 10872 bytes
SHA-256: c3b6d48d8a3ceb5fc997c0dfedce886050ab4b716f1acabd351dbc1bd7b2f88d
font_02_sfnt_off0001364a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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