Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea89c589623c8dc…

MALICIOUS

PDF

94.3 KB Created: 2021-06-04 19:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 181e06bc1cfb04416e7105fb642aae94 SHA-1: c48f42ba48d1290b7ee201294b75f556bacfcde6 SHA-256: 0ea89c589623c8dce222716fab756b1337762ec358761b91a52ad69176c1e7b2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm for SEO purposes. One prominent URL, 'https://krisoc.ru/pbw?utm_term=summertime+saga+cheat+apk+free+download', indicates a lure for downloading cheat APKs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://krisoc.ru/pbw?utm_term=summertime+saga+cheat+apk+free+download PDF link annotation
    • https://fapudunaga.weebly.com/uploads/1/3/0/7/130776769/93508.pdfIn PDF document text
    • https://zuduloto.weebly.com/uploads/1/3/4/6/134623707/18baca892dd81d.pdfIn PDF document text
    • https://mipigonegomef.weebly.com/uploads/1/3/0/8/130813466/sezejubolel.pdfIn PDF document text
    • https://lotuvimipel.weebly.com/uploads/1/3/0/7/130739731/85794bbcb44.pdfIn PDF document text
    • https://teworovesub.weebly.com/uploads/1/3/0/7/130775402/62b5b35f7.pdfIn PDF document text
    • https://lukexurilewudon.weebly.com/uploads/1/3/4/3/134335891/vuris.pdfIn PDF document text
    • https://kelonefak.weebly.com/uploads/1/3/2/6/132683111/347373.pdfIn PDF document text
    • https://gufamaran.weebly.com/uploads/1/3/4/0/134017683/8b50e534419575.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a7beee4-3877-43dc-ba19-8c05925f98a7/libelixasutijixapogapaf.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/39942970104.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c1db17a-35da-4b14-bfe0-7203b9165a78/35634941750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67757d8e-de71-4152-a443-a25c879f4654/84489723410.pdfIn PDF document text
    • http://vakerul.pbworks.com/w/file/fetch/144586392/how_do_i_cook_a_ham_in_a_roaster_oven.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144529914/como_pasar_de_ml_a_gramos_en_quimica.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144421542/flash_all_lock.bat_not_found.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/how_to_draw_a_mountain_landscape_for_beginners.pdfIn PDF document text
    • http://gibudufu.pbworks.com/f/pokemon_go_hack_apk_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f704e1b-5820-4eb6-8ae0-8a1fedb23ed0/how_to_build_a_wood_bunk_bed_ladder.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144481272/anonymous_external_attack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a02d11a-c28a-4f06-a4a5-5558fa6f442d/xixulodemumeberefozowobis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 4996 bytes
SHA-256: 1028b07524d83f9ae9f48259414159b2a1ce353f2da4265e6ad76481ad70e938
font_01_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 5828 bytes
SHA-256: 488ed58f87230059dd425911a473aba63bf9572a92f583df62c1c23e3bf5caa1
font_02_sfnt_off00011dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC1 19964 bytes
SHA-256: 95c06d3f8db4936b41d160599d876e9d447e429ebcd804b7360666430d05a117
font_03_sfnt_off000151ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BA 16696 bytes
SHA-256: 1d1cc5da8431b5b075a174e21c722000da1a45d30e8eaed9fa6b6bda1a32f472