Malicious PDF — malware analysis report

Static analysis result for SHA-256 15902fe2be58986d…

MALICIOUS

PDF

82.4 KB Created: 2021-03-30 20:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f7c3915373b30d94e0adbbb53e571fe8 SHA-1: 62b5c481d0d1fb894f689e8236961722807eb852 SHA-256: 15902fe2be58986d4985da816cef9205ec6780bf65a61f6ac45929c5c1bd4a65
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment, likely leading to a malicious website or a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://jumiwimov.ru/wix?keyword=human+ear+worksheet PDF link annotation
    • http://eurosett.net/the_art_of_tidying_up_audiobookwnffi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443815/normal_5fee099f3db49.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/hjzhgYk/subway_surfers_code_not_working.pdfIn PDF document text
    • http://giveaway2020.info/62167870469h8u0u.pdfIn PDF document text
    • http://getcabinets.xyz/taxizollbiw5.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/7hbshf0/viral_tiktok_videos_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505102/normal_5fdf90d62f498.pdfIn PDF document text
    • http://comforfemj.fun/gujosotajukakipedefiwxumj6.pdfIn PDF document text
    • https://cdn.sqhk.co/junigofulum/jjrCjgA/nelopowexopusejem.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/jdmhd14/facts_about_space_shuttles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_604158165e66e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402740/normal_5ff7cadebe48f.pdfIn PDF document text
    • http://vigastlens.xyz/vimapujo4or.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369191/normal_602b4de1aec71.pdfIn PDF document text
    • http://help-bluebadgecenter.com/92592646544ejve2.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/gapivegek/army_pt_scorecard.pdfIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_398782f8a3fb47a58d95dd12226b23b6.pdf?index=trueIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_fdec23f4575841adbddb51065d4305c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/banula/bosch_obd_1150_precio.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/avg_antivirus_update_offline.pdfIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_2ff147276215496fb2fb250ab753a452.pdf?index=trueIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_659a99c929b84bcb9a6da7c7e7628fc6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetituri/hotel_rwanda_questions.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_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 5008 bytes
SHA-256: 1addb0e8afbbcec3ba67e47abafb8c2c47bb62ddb89e99ceb94e35d7503eea6c
font_01_sfnt_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 11248 bytes
SHA-256: 9d1e5b2c824b8ebc85dbbd156fccc1716c139a8182f98b41eb2bf92d6e74ebea

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