Malicious PDF — malware analysis report

Static analysis result for SHA-256 68195bb24bb42e16…

MALICIOUS

PDF

72.2 KB Created: 2021-03-27 18:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c6c897a26edcdf4b5d578da2f58b89f SHA-1: 7c2c1ca445df936812b5fd4618e551a9b2ddc90b SHA-256: 68195bb24bb42e166ae9f3b265785196c238f6b85a3dd186b01ead1142c4e176
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a suspicious domain ('jacksth.ru') that appears to be part of a link farm. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam context. While no scripts were directly extracted, the presence of multiple external PDF links and the ML classification strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://jacksth.ru/wix?keyword=nebraska+soccer+league+fall+2019
    • http://apparently-home.com/teliguwejerazemonozamaxadmchuu.pdf
    • http://luzikudejijes.22web.org/charminar_malayalam_movie_songs.pdf
    • http://fruitslope.online/cylinder_head_porting_guidextxgj.pdf
    • http://kofoxirozagitu.iblogger.org/best_spoken_english_book_free_download.pdf
    • http://tactical-jacket-sale.shop/ascii_code_definitionrdlih.pdf
    • http://sedouche.xyz/fifth_grade_english_worksheetshpmts.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_28a394f458f94923a1f05459db1b894c.pdf?index=true
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_a66a8eaa8b9d42dbb5783fcad1d11fd8.pdf?index=true
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_cb196150a93845c8a53f6aeb3c2fc936.pdf?index=true
    • http://bezopiwuzalobit.rf.gd/palayathu_amman_remix_songs.pdf
    • http://kodadus.epizy.com/wosazijegokitil.pdf
    • http://tegikemi.rf.gd/white_6000_metal_detector_manual.pdf
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_159f17fa4bf644ef8feb2b7e42412f45.pdf?index=true
    • http://fuzonojidufube.epizy.com/top_hits_2018_album.pdf
    • http://molodetagako.epizy.com/colors_tv_serial_songs_free.pdf
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_8b2c175eb39b46738e344c450477c24f.pdf?index=true
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_64fc106b453843fea70b4c15cc287567.pdf?index=true
    • http://menimilerawapo.rf.gd/did_you_hear_what_i_said_tiktok_song.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_off0000d89b.bin
e37dcd29c49012a1d63827b4af2dfc04b1a727e65139c487cdfb5866cc19ce6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 5704 bytes
font_01_sfnt_off0000ec20.bin
02e37b1e9d51a7ca0d67af9002cb0b5ea754f45aeb4a449ceb332749ca614e04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 11640 bytes

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