Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf692fb9562668a…

MALICIOUS

PDF

91.3 KB Created: 2021-04-01 23:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccc393fd21e52cfdbe7b30a4d1a5bd6f SHA-1: 7f6eabbc570b054d39bb58d2c18404d60fe159e5 SHA-256: 7bf692fb9562668a117522e50047da2bd57b7cbe3866544af572847440c8417a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating it is part of a link farm designed to attract traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=bangla+boi+download+pdf+free
    • https://cdn.sqhk.co/wewotiwalote/sjhheMx/47082559524.pdf
    • http://lepasipun.iblogger.org/bhagwan_ka_bhakti_gana.pdf
    • https://static.s123-cdn-static.com/uploads/4381102/normal_5ffec2ab8474e.pdf
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/gopulekev_sinig.pdf
    • https://cdn-cms.f-static.net/uploads/4414495/normal_601cc37ea8a01.pdf
    • https://cdn.sqhk.co/jukusenefow/oeN3iem/34568117718.pdf
    • https://cdn.sqhk.co/nasanoroge/hj7jhcX/kawai_digital_piano_cn2_manual.pdf
    • https://cdn.sqhk.co/wixadigizal/pRnghhc/spiral_ball_game_app.pdf
    • https://cdn.sqhk.co/dubikureta/haidiaf/space_commander_movie.pdf
    • https://cdn.sqhk.co/tuzevawu/hiphcFn/91894340514.pdf
    • https://cdn-cms.f-static.net/uploads/4476566/normal_600a698d25607.pdf
    • https://cdn.sqhk.co/jovowosifo/oMheriQ/56207660759.pdf
    • https://cdn.sqhk.co/xolanikipiz/hiNXsjd/kenisilap.pdf
    • https://petirinupupa.weebly.com/uploads/1/3/1/4/131438611/xowen-xekerewulopabuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/87f6d351-1fdc-4924-98ff-9a33dc84c4c7/stephen_crane_maggie_a_girl_of_the_streets_theme.pdf
    • https://uploads.strikinglycdn.com/files/d7066ece-cabc-44a5-9dbb-b9c0cb2e4fe0/zininopijiwowugigebek.pdf
    • http://kojusefum.rf.gd/20019176848.pdf
    • https://uploads.strikinglycdn.com/files/bfec5227-a923-4634-b91c-7c7abda176c7/gifipenikijaripoxozovabem.pdf
    • http://laletowizoz.epizy.com/barfu_am_klavier_noten.pdf
    • https://uploads.strikinglycdn.com/files/67a7e3d6-4373-4096-85e8-f2d7653f02f9/dobezitisojo.pdf
    • http://wonetone.rf.gd/10th_class_maths_notes_in_kannada.pdf
    • http://xalatirasu.rf.gd/tratamiento_de_eleccion_para_ascaris_lumbricoides.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e890.bin
1ebffcd7f28885b96a748ef444ad801cd6ef2b4902b9c543a6a3d7724ae046a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 5312 bytes
font_01_sfnt_off0000fabd.bin
50b5f5787d5e996735cd2d41998a3b976a0aa59d1a885d1fd63106473acba176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 22964 bytes
font_02_sfnt_off00013980.bin
ae2bc6e30f89ab060112d8296c9e99a165509aa81592eca0148a0ad694f50a34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13980 10508 bytes

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