Malicious PDF — malware analysis report

Static analysis result for SHA-256 222a1d1a90c8d2a7…

MALICIOUS

PDF

73.4 KB Created: 2021-06-10 03:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 64f9e85147125d3f22d5889ab4bfb69e SHA-1: b6f108fb9c50fedc743831874962e1937a7b4a17 SHA-256: 222a1d1a90c8d2a7aafc12eae9a0ce0d58b92a117725010bc2e11c5892250384
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-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://nomylo.ru/pbw?utm_term=developmental+biology+book+gilbert+pdf PDF link annotation
    • https://fuloronarenor.weebly.com/uploads/1/3/4/8/134880411/tipiw_debesitos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367631/normal_5feef4527ec82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505326/normal_601baaf1bc531.pdfIn PDF document text
    • https://fazokovonopa.weebly.com/uploads/1/3/5/3/135329702/geketaxitumil_fazisugumonese_guvozujukotog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495264/normal_6006449bb7ec6.pdfIn PDF document text
    • https://bupedokan.weebly.com/uploads/1/3/1/6/131607930/a9201035.pdfIn PDF document text
    • https://tetavezodumop.weebly.com/uploads/1/3/4/6/134645623/7386041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_6027df00ba15c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403807/normal_6007cb40d277f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://damopijos.pbworks.com/w/file/fetch/144515214/sodufugob.pdfIn PDF document text
    • http://kefatezalix.pbworks.com/f/how_to_download_latest_epf_statement_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc3838f-98a0-4ba0-ad5b-b9f641cbaef6/wefewamuz.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144424236/can_you_lock_specific_cells_in_google_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d49c0d76-3d63-4c6d-8ec2-0111c6e8badd/what_are_the_bodys_3_lines_of_defense.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35d10af6-26c0-4c15-8678-3a3d41aac0d1/what_does_the_word_patriotic_mean.pdfIn PDF document text
    • http://zepupifob.pbworks.com/w/file/fetch/144426888/how_to_replace_battery_in_smael_watch.pdfIn PDF document text
    • http://jebusolole.pbworks.com/w/file/fetch/144486471/how_to_code_search_magnavox_universal_remote.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_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 5548 bytes
SHA-256: ada8c513f23422a7b5c45287f45f482d6d049b977137e9ba2ed37f600948a73c
font_01_sfnt_off0000f244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF244 10756 bytes
SHA-256: 3158ea36a128a38bc8d5adc3e7fc1039fbd07d98f785967e93d69550254ae4ea

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