Malicious PDF — malware analysis report

Static analysis result for SHA-256 96099dc657fe4769…

MALICIOUS

PDF

86.8 KB Created: 2021-03-23 05:10:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22de7e4b6b619837834e17fd3c0df1a9 SHA-1: 1168ce285ea8a9567a863fe93ebbd73a86447999 SHA-256: 96099dc657fe476966164d613f219488440cefa74ea15f3fa6ad545572339085
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=aschenputtel+m%25C3%25A4rchen+text+pdf
    • http://hookup668.site/16685788821pxsm9.pdf
    • https://cdn.sqhk.co/zenegiwowi/pCSic5l/neduvuwagilifal.pdf
    • https://zatuduxe.weebly.com/uploads/1/3/4/5/134595584/c73dc4a17b3d5.pdf
    • http://dumubemajizukov.medianewsonline.com/how_long_does_it_take_to_become_a_nuclear_physicist.pdf
    • http://bugosegu.scienceontheweb.net/easy_piano_songs_with_letters.pdf
    • https://gemuvubakada.weebly.com/uploads/1/3/4/4/134494784/rudoxelekev_pafukix.pdf
    • https://cdn.sqhk.co/rasadenibe/jaWuZhe/guess_the_movie_actors_malayalam.pdf
    • http://mitatizizuje.mypressonline.com/arduino_uno__ethernet_shield.pdf
    • https://wefikugozakilo.weebly.com/uploads/1/3/1/0/131069992/zubamad.pdf
    • https://cdn.sqhk.co/ramejolir/OMjbU2M/fuxugubuwawipawubepufowim.pdf
    • https://cdn.sqhk.co/xubipoxeguza/jfngeif/download_piano_magic_tiles_2_mod_apk.pdf
    • http://juwupexutaval.mywebcommunity.org/why_is_my_tv_screen_have_lines.pdf
    • https://kizutete.weebly.com/uploads/1/3/4/0/134000266/gigar-jukusovixenopu.pdf
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/5764020.pdf
    • https://cdn-cms.f-static.net/uploads/4500446/normal_603615dd3374b.pdf
    • https://static.s123-cdn-static.com/uploads/4403685/normal_5fc9bfeb03652.pdf
    • https://cdn.sqhk.co/goberirud/jbpgigj/miratelogakekito.pdf
    • http://xufikefizot.sportsontheweb.net/maths_questions_for_class_3.pdf
    • http://rodina38.ru/79384283970b4wgx.pdf
    • https://cdn-cms.f-static.net/uploads/4412160/normal_600ca203de949.pdf
    • https://cdn-cms.f-static.net/uploads/4476952/normal_6025ad04cd7cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_fc8f8ab9bb504258a7f030e8ec44be4b.pdf?index=true
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_c62fb6fc10a645aea2e8b65ecbcafd55.pdf?index=true
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_de4b0974087c49e29f485ad55fb06c4b.pdf?index=true
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_90866dcfa0a142b4a8db5b5b264e540f.pdf?index=true
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_e1c37c12ab74459eb9348addae18a43d.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001003b.bin
197c0c66dc16125be246e231ea76cf39c1df205e7190e31352d77c9700182c03
pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 5476 bytes
font_01_sfnt_off000112b4.bin
f757352e67552284fa4be670c53de8c985f0aa4ac64d2894f9b3e39432abe2ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x112B4 10256 bytes
font_02_sfnt_off00013614.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13614 16204 bytes