Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd52c1e809fe8c7…

MALICIOUS

PDF

72.3 KB Created: 2021-01-20 03:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8fd1a47bea831c261786e4a342c49c4a SHA-1: 7c0465bc3bf789c569d18dc9585fa87a9578b9f4 SHA-256: bbd52c1e809fe8c7ff09670287bc7a9bc8942b1bf042d02fcd4b0fa55c0f5776
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=first+baptist+church+panama+city+beach+florida PDF link annotation
    • http://selolaz.66ghz.com/free_sheet_music_piano_yesterday_beatles.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/ligKXje/home_depot_bricks_for_fire_pit.pdfIn PDF document text
    • https://cdn.sqhk.co/towafeniruje/0gfijif/nizukovaputes.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/aRErijj/skin_colored_mole_on_nose_removal.pdfIn PDF document text
    • https://site-1183794.mozfiles.com/files/1183794/my_lottery_dream_home_host_face_tattoos.pdfIn PDF document text
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/7518776.pdfIn PDF document text
    • https://tiwofimobodes.weebly.com/uploads/1/3/4/0/134040820/9717037.pdfIn PDF document text
    • https://cdn.sqhk.co/dedejosewor/uhRhchi/bufavitemisilukuvaniloli.pdfIn PDF document text
    • https://site-1168202.mozfiles.com/files/1168202/sitazatolezejakukotojurem.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/hcUhht0/how_to_boost_your_children_s_self_esteem.pdfIn PDF document text
    • https://vufujisuwe.weebly.com/uploads/1/3/1/4/131437295/dutasufibo-xetulofu-zutibuser-mazaz.pdfIn PDF document text
    • https://cdn.sqhk.co/zatuwifezub/ibjfU5G/nejenetud.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/iSgjel5/turbo_traffic_racing_3d_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wejagamewo/niahheu/brhe_berry_photos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gojexigubobe.epizy.com/discussion_forum_website_template_free.pdfIn PDF document text
    • http://zepedijuva.epizy.com/11706180226.pdfIn PDF document text
    • http://nabikelotedabe.epizy.com/52298023085.pdfIn PDF document text
    • http://jojudodadanu.epizy.com/technical_specification_template_software_development.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8D 5592 bytes
SHA-256: 467747742ca97c6349a327c0a9a22d2c40b74e08b6811cdd8c9083fe9f49e32f
font_01_sfnt_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 10276 bytes
SHA-256: adb0741b132b2e897f33a19c6ea1cc4b46571c056faad2a151b4de3af8b68617

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