Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0107e94bc6eb5c…

MALICIOUS

PDF

85.9 KB Created: 2021-02-28 22:03:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 434b647c8e2a13e9c1741bd20684177d SHA-1: ba3a780da3c3a6ddca8d2dc9793c19bb59fd5ebd SHA-256: bf0107e94bc6eb5cd5bfab7dcdeb01d646ca86553c9d2eede238421ff2f80b98
186 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The embedded URLs like 'https://xajibur.ru/strik?utm_term=define+impulse+of+a+force+with+an+example' are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure and numerous external links strongly indicate a malicious intent to redirect users.

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://xajibur.ru/strik?utm_term=define+impulse+of+a+force+with+an+example PDF link annotation
    • https://cdn.sqhk.co/xutazazo/jdPujeK/best_ice_cream_flavors_baskin_robbins.pdfIn PDF document text
    • https://cdn.sqhk.co/bisegepamitu/jwjcNZn/joketagogutigijukubozip.pdfIn PDF document text
    • https://ropaligezavizaf.weebly.com/uploads/1/3/5/9/135962070/3151a.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/hUyYqG2/murder_mystery_box_set_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469626/normal_5fe0b7d5ed275.pdfIn PDF document text
    • https://cdn.sqhk.co/nebinefis/aY3Lgcy/replace_new_3ds_xl_screen.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/jbMPqEU/archery_elitetm_free_multiplayer_archero_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481069/normal_5fd0d764caecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_600a7bffd4e7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449777/normal_5fe45d8902e15.pdfIn PDF document text
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/3527671.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/76043939226.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/47927485215.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/worksheet_context_clues_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/kuwadaxaro.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/the_lightning_thief_musical_music.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 5412 bytes
SHA-256: 196a5c5981a87cc0dd2d123d8749cacfa0fa552072ca86828c913b35ca3264b3
font_01_sfnt_off00010de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE6 11456 bytes
SHA-256: 4c4a6d744cda87b5cdde5fdd2aa006f73cf7f85d172fc558cdacd44778d02e55
font_02_sfnt_off0001352a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352A 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833

Open this report in the interactive analyzer, or submit your own file for analysis.