Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5139dd8d296cb2…

MALICIOUS

PDF

79.0 KB Created: 2021-02-28 06:00:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28d5695bbbf3fcb1dd6098cebd359569 SHA-1: 735e85c8d447061db25a95d767caaca75112aab1 SHA-256: ec5139dd8d296cb2f54a5108891bb86c4907c8f5f181764691b9085484d9f48a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to PDF files, indicating a link farm for SEO manipulation or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

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://botokaw.ru/wix?keyword=potion+of+luck+minecraft+xbox+one
    • https://cdn.sqhk.co/fukonovum/hfhgDge/mawirofiwedulosidimuzan.pdf
    • https://mitafewojoruwe.weebly.com/uploads/1/3/1/3/131381680/ace6e4a109a.pdf
    • https://fodolirikixubug.weebly.com/uploads/1/3/5/2/135297927/dazakamina.pdf
    • https://vekafikag.weebly.com/uploads/1/3/5/9/135986004/tidunu_mepekabirapiz_kavodi_tipixuwanuv.pdf
    • https://cdn.sqhk.co/wareberefiz/jgfm0ei/best_pop_up_truck_camper_brands.pdf
    • https://xevujudibibabus.weebly.com/uploads/1/3/4/5/134599482/dudaxebe.pdf
    • https://cdn.sqhk.co/belesobikezi/vibuZic/small_world_zaidimas.pdf
    • https://cdn.sqhk.co/moturalogupe/aijnghd/60758471731.pdf
    • http://kenugizi.getenjoyment.net/vasaxagodesanexego.pdf
    • https://cdn.sqhk.co/nijusukelok/cjjx3iE/download_game_car_crash_test_niva.pdf
    • https://cdn.sqhk.co/fodexuxefeba/gggichj/40557163286.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bojafazes/62282144201.pdf
    • https://s3.amazonaws.com/jawusawar/kamyab_jawan_program_form_2019.pdf
    • https://s3.amazonaws.com/lekizopiloref/14577701372.pdf
    • http://kilarosine.atwebpages.com/am_fm_radio_best_reception_reviews.pdf
    • http://vidugozu.atwebpages.com/71286829009.pdf
    • http://fubavinexazixo.onlinewebshop.net/ludepabeluw.pdf
    • https://s3.amazonaws.com/jagux/free_sports_tv_apk_for_android.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_off0000f99e.bin
443c570bfdc80bd8206d5fe19bad7cae301dd6d2a311467458f3f7af1b00a127
pdf-font-stream PDF embedded font (sfnt) at offset 0xF99E 5120 bytes
font_01_sfnt_off00010aff.bin
7c3910f6e63087ee8a8d83b9a2952a0b3167edcd75731761de8f49eb724fc1ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 10464 bytes