Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ff2617aaedf8a1…

MALICIOUS

PDF

76.3 KB Created: 2021-06-10 13:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35112dd008941e6b19eeaed2b6b2f157 SHA-1: ad548be85e7e9f1085f546e0ae7d66ab2dbe1b80 SHA-256: f0ff2617aaedf8a13c46799063599dde5e2aa73a115b7f2b972da8b567af8fad
156 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 of which appear to be part of a link farm designed to attract users with popular search terms. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/pbw?utm_term=gaddi+lamborghini+song+mp3+free+download
    • https://mijonezogiju.weebly.com/uploads/1/3/4/3/134308960/d9b1085.pdf
    • https://cdn-cms.f-static.net/uploads/4496015/normal_606284240935d.pdf
    • https://cdn-cms.f-static.net/uploads/4424630/normal_60bd8a26daf14.pdf
    • https://nazewaraja.weebly.com/uploads/1/3/5/9/135959380/c88dee5dcf0881c.pdf
    • https://static.s123-cdn-static.com/uploads/4495531/normal_5ffef7e35ea73.pdf
    • https://cdn-cms.f-static.net/uploads/4454420/normal_6009cb46aacfd.pdf
    • https://cdn-cms.f-static.net/uploads/4481516/normal_602311a3236f2.pdf
    • https://biwusegunaji.weebly.com/uploads/1/3/4/0/134096831/kegowazokidosunixel.pdf
    • https://static.s123-cdn-static-d.com/uploads/4491173/normal_60b6eb71d1f2c.pdf
    • https://static.s123-cdn-static.com/uploads/4392658/normal_5febc3e41fa1f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://nukuxim.pbworks.com/w/file/fetch/145035786/wegujegugavun.pdf
    • http://nuxawakaxaz.pbworks.com/w/file/fetch/144902109/fobumu.pdf
    • http://serukula.pbworks.com/f/pokemon_the_movie_2000_full_movie_download_in_tamil.pdf
    • http://zelovoguvunu.pbworks.com/w/file/fetch/144427368/dark_flippy_x_reader_lemon_wattpad.pdf
    • http://sejuworepow.pbworks.com/f/60228043099.pdf
    • http://gozigelogani.pbworks.com/w/file/fetch/144965442/39642799618.pdf
    • http://molosafokaji.pbworks.com/w/file/fetch/144621969/hernndez_sampieri_r._2014._metodologa_de_la_investigacin.pdf
    • http://negipidini.pbworks.com/w/file/fetch/145022994/canon_p170_dh_reset.pdf
    • http://mitamugukojo.pbworks.com/w/file/fetch/144676893/babasirebebugewaramojejoz.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_off0000dd5d.bin
51aa7533643b9d72d68909282bb43ebf80ae89ab62d608b31ed43f5dc5e8e820		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 5592 bytes
font_01_sfnt_off0000f03a.bin
73ad2ed7c8f702f6e951deeb0aab643d2b2c5155034387887d616d092db1cd95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 11076 bytes
font_02_sfnt_off000115fe.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115FE 4324 bytes

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