Malicious PDF — malware analysis report

Static analysis result for SHA-256 811536bb527ad611…

MALICIOUS

PDF

67.1 KB Created: 2021-03-24 06:06:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 698989a5ac265fa67ecdc328e58cf840 SHA-1: 6e3cdcd65aad73b117a681fce62f307cce958757 SHA-256: 811536bb527ad611eb4a0c09400ae23322e0eeb9589a3df63da1fea9bdfdefbe
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily corrupted, suggests a lure related to a product manual, which is a common tactic for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/wix?keyword=poulan+pro+550ex+manual+espa%25C3%25B1ol PDF link annotation
    • http://com-copyrighit.com/html5_games_tutorialsqtgq.pdfIn PDF document text
    • http://jusapp.club/67588918220tmezz.pdfIn PDF document text
    • http://rezufuzogodini.iblogger.org/english_grammar_book_grade_3.pdfIn PDF document text
    • http://trokot-shtorki.online/is_year_of_the_fire_horse_lucky_in_20208veka.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/heisenberg_report_reviewjtzg7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467007/normal_5ff51cd333e95.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxifobiro/hiajdAE/indicative_term_sheet_sample.pdfIn PDF document text
    • http://dixojele.22web.org/kingsoft_spreadsheet_shortcut_keys.pdfIn PDF document text
    • http://euroshopme.site/vuboxujeribetugoranonfjdfa.pdfIn PDF document text
    • https://cdn.sqhk.co/sofetarunox/d9hc1Yn/23227232803.pdfIn PDF document text
    • https://cdn.sqhk.co/pozazoji/gjd3gcp/17456682015.pdfIn PDF document text
    • http://teritexi.22web.org/xakakinasewewitosasitara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470391/normal_6020bd4e3fdb1.pdfIn PDF document text
    • http://chambreapp.xyz/how_many_questions_are_on_the_cdl_class_a_general_knowledge_test1rhfy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416327/normal_5fd1a43e58c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_604b0d9d9e435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375200/normal_602860c3802b7.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/1KP6hcr/sanerakuwa.pdfIn PDF document text
    • http://hookup681.site/46411802729vyjwt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_8e2998d7608a463f93eb43cb5981e19c.pdf?index=trueIn PDF document text
    • http://roxadib.epizy.com/37073211941.pdfIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_fdbf4d3f1455482d8cf4e1c61e4679e6.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_off0000c543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC543 5512 bytes
SHA-256: 513b9862cc783e859eb7be0e96513774d7a23fb74f60b4f89c7b7034d0820592
font_01_sfnt_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 11568 bytes
SHA-256: 6e32a68556cb5cd4ad336427bcc4a72d787e3d7632bcd1c3a01ec93a67b371e2

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