Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e8123ba4c94ee5…

MALICIOUS

PDF

76.8 KB Created: 2021-01-24 12:22:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8b432523ba96067d96d6c59d44b97df SHA-1: fa26ccd79c347e57b6a0772afb0c008454b3cc0d SHA-256: 26e8123ba4c94ee52ce258c2b50a07d07f00ec17263a65d7793f726f0b373289
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm and redirector. It contains numerous embedded URLs, including a critical link to known malicious infrastructure at 'https://yafferge.ru/123?utm_term=discworld+mort+pdf'. The document's structure and embedded links suggest an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/123?utm_term=discworld+mort+pdf
    • https://cdn.sqhk.co/rolaravez/TsVibkO/71118911400.pdf
    • https://tivositazevuzin.weebly.com/uploads/1/3/5/3/135349871/wuxuwi.pdf
    • http://help-bluebadgecustomer.com/286419944285gxiw.pdf
    • https://dalideno.weebly.com/uploads/1/3/5/3/135384103/9819002.pdf
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/wejumok.pdf
    • http://capridigi.com/bottle_flip_challenge_dab_2_gameu9aqy.pdf
    • https://zalogarigi.weebly.com/uploads/1/3/2/6/132695681/dd02ce99f.pdf
    • https://cdn.sqhk.co/momujolo/KdhdiiQ/ea_sports_fifa_21_companion_download.pdf
    • https://cdn.sqhk.co/jesisuvov/bxib3WW/heroes_of_hammerwatch_light_puzzle_solver.pdf
    • https://cdn.sqhk.co/xenudipu/gTMiffH/new_guitar_love_ringtones_2020.pdf
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/9351839.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tamobalasu/html5_inventory_management_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfc.bin
122605f10712c34c6aaaab53c62392ca663e1ee607d26f664a736da524401508		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 3128 bytes
font_01_sfnt_off0000e91a.bin
443a9b9b318aec9ab15acb7e18686dd428237fdcfc371a3e943833cfceb129ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 5180 bytes
font_02_sfnt_off0000fabd.bin
483753ba6c1f8ae315a113b30eb86c124a0c093a7133804944bdbe143167cdf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 13884 bytes

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