Malicious PDF — malware analysis report

Static analysis result for SHA-256 a60eb2bb155fa926…

MALICIOUS

PDF

73.9 KB Created: 2021-06-09 17:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8d9208cedfb66be905ad588db20635f0 SHA-1: 512927ff8502bc720de50c389f9b3fe401be7709 SHA-256: a60eb2bb155fa926275b3068d48a7eb6fdf462b9644bf288880ebee283717f99
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'drafthe.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a malicious intent. No scripts were extracted, but the presence of external URIs and the overall detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://drafthe.ru/pbw?utm_term=future+continuous+and+simple+future PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369660/normal_606c2f1f75d73.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4419847/normal_60b19c8715891.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374835/normal_5ffae777b94fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490746/normal_5ffc80d73b343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404528/normal_6068e8889a8da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473632/normal_601e0236a6a5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_6060efbaf3795.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369494/normal_5ff94c0ec8e9f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepoline.pbworks.com/f/muwugadexetitusemi.pdfIn PDF document text
    • http://gajufabeke.pbworks.com/f/69450537452.pdfIn PDF document text
    • http://jawegele.pbworks.com/f/changing_states_of_matter_worksheet_grade_7.pdfIn PDF document text
    • http://jetipufagi.pbworks.com/f/how_to_use_my_cricut_explore_air.pdfIn PDF document text
    • http://jawegele.pbworks.com/f/how_to_enter_on_sinotec_tv_without_remote.pdfIn PDF document text
    • http://lebamojopa.pbworks.com/w/file/fetch/144918615/download_coc_fhx_2019.pdfIn PDF document text
    • http://joxupakager.pbworks.com/w/file/fetch/144601035/quality_check_sheet_template_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0002a2eb-9495-461c-b04d-d456fcf7b82c/86315209921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436de976-d35f-457c-93a1-cc94febd9213/arduino_uno_board_layout.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/54474208784.pdfIn PDF document text
    • http://silasofinat.pbworks.com/f/58234670466.pdfIn PDF document text
    • http://dekokos.pbworks.com/f/jinedomu.pdfIn PDF document text
    • http://fosirodovo.pbworks.com/f/vemumovozabapovoregafizex.pdfIn PDF document text
    • http://nidibewuzi.pbworks.com/f/65504159718.pdfIn PDF document text
    • http://pugaxigodaka.pbworks.com/w/file/fetch/144462264/can_you_root_amazon_fire_hd_8.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_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 5256 bytes
SHA-256: 86093d214d7e35e2606a331f33d8d09be4f03d6fd65d3c857dbd8526753b3750
font_01_sfnt_off0000f5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A0 10716 bytes
SHA-256: d014263dfa51205a565ec3bd773b121d71424ec7feaae94860c7b2c36601c6c6

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