Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41e97484e5fb73e…

MALICIOUS

PDF

78.6 KB Created: 2021-04-27 10:29:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ed5bf72f08e9a6dd893b508c8c4fa323 SHA-1: 72012eb0650c67d2cc5d6a6aa80bde4fb6aa2682 SHA-256: a41e97484e5fb73e7af07f6313e53669b4ddb35312cd34b6e6e1e66f65e4094d
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. 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 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) 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://vilenefex.ru/strik?utm_term=can+you+cook+pasta+in+an+electric+pressure+cooker PDF link annotation
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/fezepewebixob_kezuxuxofituzu_lovuxorebenugod.pdfIn PDF document text
    • http://ita-bio.fun/dining_table_decor_modernzfc6g.pdfIn PDF document text
    • http://medyayazilimtr.com/can_i_use_a_wii_u_pro_controller_on_nintendo_switchmie0f.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/6604e83fae8.pdfIn PDF document text
    • http://esportzmlevent.com/96744691533e3tvq.pdfIn PDF document text
    • http://save50.pro/77032577717dtcoa.pdfIn PDF document text
    • http://khareedforosh.com/can_i_cancel_my_american_eagle_order12ltu.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/fuxokisofis.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://easterthjg.com/go_to_market_strategy_template_freevmozp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/72a9582a-0a51-48e6-acda-ce4777e19622/can_i_find_my_google_account_by_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9a6fecd-699a-420b-bda0-265405bd0e98/lodoj.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/eleven_by_sandra_cisneros_short_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/hadoop_hdfs_command_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a6a267a-374e-4dee-81f8-b9d5bbeb3046/patterns_for_college_writing_13th_edition_year.pdfIn PDF document text
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_fe7cd65c64524742bd24fe63c4e856c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faxaxos/70675519895.pdfIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_890ae09927bc4c31bee7fa0c14e3f361.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/defujo/android_definition_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05cfa461-5bb1-4acc-bb17-8851405bd706/mejurixisajomajojor.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_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 4996 bytes
SHA-256: 816b13850f2eb21904a203d62938f0bb90ec74384e65581e9b3caed606770c2d
font_01_sfnt_off000104a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 11196 bytes
SHA-256: ac30f8d0f9765515ba02a25b83a30351b71eb9f8cbfc66102f52b765ad60a97b

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