Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcb1154efce464d…

MALICIOUS

PDF

70.3 KB Created: 2021-02-24 02:31:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 52a6ff0700bb381af160d1b5bea808f6 SHA-1: 36a4cbf20b3d156e9853ae726b4ab6e3a0f0c4f2 SHA-256: efcb1154efce464d389905ac178ee85e506e72e1c2b5ebd0e903217c39a39380
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The document body, though heavily corrupted, suggests a lure related to 'math logic questions pdf'. The primary malicious URL identified is https://baarspo.ru/strik?utm_term=math+logic+questions+with+answers+pdf, which is likely used to deliver a secondary payload or redirect to a phishing page.

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://baarspo.ru/strik?utm_term=math+logic+questions+with+answers+pdf PDF link annotation
    • http://riforemepenog.iblogger.org/good_morning_photo_hd.pdfIn PDF document text
    • http://tivepijezar.22web.org/best_tarot_love_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/letowajaf/RPpKqlk/domino_s_menu_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/ninilevikod/aheibhc/44556432874.pdfIn PDF document text
    • https://telozigigozato.weebly.com/uploads/1/3/4/3/134310186/5148529.pdfIn PDF document text
    • https://lumodafudewose.weebly.com/uploads/1/3/4/4/134480169/80f8cb88f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371807/normal_5fdd713cac443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407998/normal_601da99c2c006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374704/normal_6000b5749e63f.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/iVhfbig/miraculous_ladybug_season_4_episode_2.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/h8jjLgf/19903775666.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wutisigila/22615861567.pdfIn PDF document text
    • http://gorulilul.rf.gd/tirunuvatafiraritime.pdfIn PDF document text
    • http://sekekubonigav.rf.gd/word_template_brochure_tri_fold.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/59988186699.pdfIn PDF document text
    • http://kewoxorewozox.rf.gd/kobajavuta.pdfIn PDF document text
    • http://xemozaso.rf.gd/makugijiwised.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_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 5640 bytes
SHA-256: f918fe558e45f9e920d80cd1db2c9ef46a8ca9971a9d82d731d21c4294da2d27
font_01_sfnt_off0000e77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 10656 bytes
SHA-256: 2f31f8b598628a59c61a568af9fbb5edac23c5c3827fd9dced02ace3c5fb18b4

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