Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ddd7653343ad08d…

MALICIOUS

PDF

70.8 KB Created: 2021-06-11 07:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3632dda84e23bb939b3042c2bf498f73 SHA-1: e50f50d9bfb7752d3289c9a5c35ef3828b985310 SHA-256: 1ddd7653343ad08df8a5af297cfaf43ff2a9da4a6218e2ffcea35017d9aace24
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to host many PDFs. The primary URL suggests a lure related to 'piano sheet music' to entice users. While no scripts were directly extracted, the PDF structure and extensive external linking are indicative of a phishing or malware distribution campaign, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/pbw?utm_term=canon+in+d+minor+piano+sheet+music
    • https://medabuxizuf.weebly.com/uploads/1/3/4/3/134383904/654559.pdf
    • https://nuzopotox.weebly.com/uploads/1/3/4/4/134497293/magenija.pdf
    • https://wabalunizuwa.weebly.com/uploads/1/3/4/6/134643533/9041627.pdf
    • https://dodaxopaz.weebly.com/uploads/1/3/4/8/134865523/7f66ebfd83ff.pdf
    • https://nobiramiw.weebly.com/uploads/1/3/4/4/134403563/9e1c418f4bf140e.pdf
    • https://tenojamerefu.weebly.com/uploads/1/3/1/8/131857247/solaxixadaronarise.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/abc3ec18-70aa-43a3-8967-582a9d601134/54335609669.pdf
    • https://uploads.strikinglycdn.com/files/80d7e9a0-07dd-490d-a1fd-963de836cc04/zojawikevevefenevobulawo.pdf
    • http://kesowununak.pbworks.com/f/28120686207.pdf
    • http://funesut.pbworks.com/w/file/fetch/144632568/sigetigibomovu.pdf
    • http://dadilotofexi.pbworks.com/w/file/fetch/144958443/forestofgames_gta_vice_city.pdf
    • http://jajafad.pbworks.com/f/mobile_app_development_interview_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/3c6022f4-a823-4f3f-9c74-66a897a6c8d6/malcolm_x_oxford_speech_transcript.pdf
    • http://ludagobef.pbworks.com/w/file/fetch/145105101/undertale_piano_letter_notes.pdf
    • https://uploads.strikinglycdn.com/files/7a325e4f-dd61-456a-8b96-2fa503ec5847/how_long_does_it_take_to_charge_my_magic_mouse_2.pdf
    • http://letonepamusi.pbworks.com/f/54403132266.pdf
    • http://jabodawo.pbworks.com/f/collins_vocabulary_for_ielts_vk.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d853.bin
295cff91c927c4c660e7118c79ebea95ae8df2fdd7452faebcf08e379ea6d88b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 5184 bytes
font_01_sfnt_off0000e9c2.bin
3e50ec2bd3ff43475434f73975b860a4ddfc03024f56ea18f409bf8f327188d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 10508 bytes

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