Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8de116f4b1c9df…

MALICIOUS

PDF

71.2 KB Created: 2021-03-17 23:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4c77a7f77617b465447102ea447c2cb5 SHA-1: ca8c21badf0694a55b80138e2289ca9cc11ff3dc SHA-256: 2b8de116f4b1c9df96fd61acdc6dbad96a78ae373727cd6251626360ea603387
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to make a phone call, a common tactic in callback phishing and tech-support scams. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to direct the user to malicious content or services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://gimoguvi.ru/wix?keyword=carta+te+extrano+mucho+mi+amor PDF link annotation
    • https://cdn.sqhk.co/dakuwuwuzije/bgjhejd/93274011436.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/os1Yoje/gewolazi.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/cii5yk8/monster_hunter_world_fatalis.pdfIn PDF document text
    • http://mavavuvew.22web.org/rutakisavezebu.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/70918136268.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pewaxoxepizus.rf.gd/washington_wizards_standings_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74965f22-944a-49f8-8a83-4de80843c30a/how_to_charge_nimh_batteries.pdfIn PDF document text
    • http://jidoreno.epizy.com/above_the_line_promotion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d9219f8-c0e6-4a58-b68c-a49f424f43f0/iphone_6s_plus_schematic_boardview.pdfIn PDF document text
    • http://tikeresepujel.onlinewebshop.net/5th_grade_vocabulary_word_list_with_definitions.pdfIn PDF document text
    • http://wijotakobeje.epizy.com/78345634987.pdfIn PDF document text
    • http://witesenigo.atwebpages.com/jidodumilusudanusejil.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/9425837992.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/14850430526.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/brisbane_hourly_weather_report.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_off0000da6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 4800 bytes
SHA-256: 05dfe8fcffa3314db1d9ee7f629c0e2c7dfa83d9fa0d7e425418c28eb7875dfc
font_01_sfnt_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 10988 bytes
SHA-256: c0b09558f397d05d91618efe2704d1c87caf3a2e6014e92e9f777e845457bbe1

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