Malicious PDF — malware analysis report

Static analysis result for SHA-256 d745526059c90a90…

MALICIOUS

PDF

76.3 KB Created: 2021-04-27 06:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9c19f9d8e1ffaa44dfc5d4faad23ebb2 SHA-1: 1688c6fc4cd22c0da7b0cc7add39cb84e86a48fd SHA-256: d745526059c90a905da586c61aceb4e148cfd4e16a74655612ef61c4dc482419
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://nipisod.ru/strik?utm_term=siyahamba+lyrics+chords PDF link annotation
    • https://cdn.sqhk.co/jigijobofofa/qjhhcje/movies_and_tv_shows_quiz_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478414/normal_603d27e63121c.pdfIn PDF document text
    • http://frut-tree.site/1796524352i7r4j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484156/normal_6011f395ab6d9.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/22kiihc/62514054596.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/jHtjbhh/42014778927.pdfIn PDF document text
    • http://0fruit.space/tv_guide_canada_rogers_toronto6cldq.pdfIn PDF document text
    • https://cdn.sqhk.co/rufetuzek/avohdid/wiziru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460266/normal_6020a4b6ad5cf.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/JDrzijf/johnny_bonasera_2_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_604d0bed3b7ca.pdfIn PDF document text
    • http://zootime.store/over_the_rainbow_original_ukulele_chordsepozl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_bd0d0cce70bc43b3ae4fc7cdeef83e88.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_a6e9634ceae34330821cff25cdba344f.pdf?index=trueIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_79a82c1fd71a48e098ba03a06633e927.pdf?index=trueIn PDF document text
    • http://jarebavax.epizy.com/examples_of_spreadsheet_computer_software.pdfIn PDF document text
    • http://biwajitakawa.epizy.com/1798613197.pdfIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_8ad38c3b682e4bce82a4d6b45c733f2b.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_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 5524 bytes
SHA-256: 717e435c92f1a457a43832f8cd6dd81bc7a629ff954f4292a680144be3cf2ec2
font_01_sfnt_off0000fe57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE57 11208 bytes
SHA-256: 6c5106e4bf3cf2235e3a4954633a2d38f87a11a45ccdab2a8c70ad417dab039b

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