Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7537308b8d9467…

MALICIOUS

PDF

80.4 KB Created: 2021-03-24 00:26:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04e4db1f169b29680721e9151ad581f2 SHA-1: 63a8f8f3fe6a161b82a6ff2f0661bae91b13420c SHA-256: 9a7537308b8d94670dfb683ffc063c1d04afc54ad692d7555b73fa380fbfb6c8
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, indicating a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kuzutuzo.ru/strik?utm_term=which+roomba+works+best+for+pet+hair
    • https://bozadabeduli.weebly.com/uploads/1/3/4/8/134869561/bawifoluluj.pdf
    • http://braco.ru/traffic_signs_worksheetme6uf.pdf
    • http://hopecommunitynaz.com/ruvibufidxe78.pdf
    • http://winoraama.fun/how_to_create_a_blog_for_dummiespfb7s.pdf
    • https://cdn.sqhk.co/zogowefu/eUhgvih/pezoruseposefexizitevu.pdf
    • https://berizezemimuto.weebly.com/uploads/1/3/2/6/132695806/1495768.pdf
    • http://lifegirls.site/the_lazy_mans_way_to_richestjar9.pdf
    • https://cdn.sqhk.co/givesaxi/ijh2Mgj/battlelands_royale_play_online_for_free.pdf
    • https://tuxaxigete.weebly.com/uploads/1/3/5/3/135324810/fufom.pdf
    • http://tk-pobeda.site/slingbox_m1_for_sale_rifle4obde.pdf
    • https://cdn.sqhk.co/kubabulukod/lWhgpjy/33640066031.pdf
    • http://jumbochecker.com/red_harvest_dashiell_hammett8op84.pdf
    • https://larunigilusevim.weebly.com/uploads/1/3/5/3/135320243/6534726a328.pdf
    • http://rocketdocs.us/vuximakivotewizilubxv7kd.pdf
    • https://cdn.sqhk.co/nilamemiw/dnSHxQx/rurijotazimi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_2b8721920775486b9cbcb23a8ca3d741.pdf?index=true
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_ed4252ddadd34424b658cf049b76f7ad.pdf?index=true
    • https://s3.amazonaws.com/bivanud/harvard_computer_science_reading_list.pdf
    • https://s3.amazonaws.com/tojabixefova/webejoxizuwune.pdf
    • https://s3.amazonaws.com/desenaz/beauty_plus_premium_apk.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/abstract_3d_wallpaper_free.pdf
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_04d7f0572fa14fda9fc1ec3aa119bcc6.pdf?index=true
    • https://3ecc1590-a62a-4317-9845-4395e9141a58.filesusr.com/ugd/237bf7_072399d5be594392b3571d1e866b51da.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000facc.bin
2f974bdb2d3a82f2a31422dea9e26558287534b7703d0fa82178e6502d4d3d33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 5532 bytes
font_01_sfnt_off00010d8d.bin
c1eaa5c32509dcfe28243daa0555dc555b3ea047cc594f8c5a8e14a26c0e2f39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 10928 bytes

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