Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c72c5c135b8c4a1…

MALICIOUS

PDF

75.9 KB Created: 2021-03-07 10:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 22b559bc2758fbaeb55c8ee0888517b7 SHA-1: f90507f1b19dc9b84e04e436fa753b6cbf878f61 SHA-256: 5c72c5c135b8c4a10e54e0fb17384fab007df916513d3cac0be0550f158fdae3
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The primary URL, https://seumenha.ru/strik, appears to be part of a phishing or scam campaign, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious, supporting the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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/strik?utm_term=what%2527s+the+best+screen+protector+for+galaxy+s9+plus PDF link annotation
    • https://nukawidizuzaxep.weebly.com/uploads/1/3/3/9/133997642/700428.pdfIn PDF document text
    • https://naloguvobiwulup.weebly.com/uploads/1/3/1/1/131163976/gaxub_kapifegopa.pdfIn PDF document text
    • http://useraisins.pro/30813206628jho5f.pdfIn PDF document text
    • https://turabebusaweni.weebly.com/uploads/1/3/1/4/131438207/5e576878228ea83.pdfIn PDF document text
    • https://tofajoxoroj.weebly.com/uploads/1/3/1/6/131636991/kanowomubaperawaza.pdfIn PDF document text
    • http://kamaz-ftc.com/working_principle_of_ammeterhe31h.pdfIn PDF document text
    • http://899themes-demo.ru/wunasovigipevnuz7a.pdfIn PDF document text
    • https://xigolomo.weebly.com/uploads/1/3/4/4/134483438/falabelagazexat_gafutubegonemen_nivifubebiba.pdfIn PDF document text
    • http://dutov.org/mrs_piggle_wiggle_movieqtk2i.pdfIn PDF document text
    • https://wudumimimi.weebly.com/uploads/1/3/4/3/134356267/35bb43951b4c4.pdfIn PDF document text
    • http://aycotoro5.xyz/what_is_visual_aids_in_easy_wordsl5ov4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kazaxese.epizy.com/princess_diaries_quotes_joe.pdfIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_ef2c362c9efa48c08e9e5d881b097d2d.pdf?index=trueIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_80ea6b7cae324dc689957d6418254df6.pdf?index=trueIn PDF document text
    • http://wigebinijeg.epizy.com/julius_evola_best_books.pdfIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_b900f453223e4044a246088109bbf106.pdf?index=trueIn PDF document text
    • http://mowowaruxuxizim.rf.gd/asp.net_mvc_tutorial_for_beginners_visual_studio_2019_with_c.pdfIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_9ee287ef58c44c96b343459f63b2fa03.pdf?index=trueIn 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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 5792 bytes
SHA-256: 2e51c4c5e8f28766b2a3e1f3c2baf330ea78662c47d2943163c45450ac97847c
font_01_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 11036 bytes
SHA-256: 14e3295a677eab404a4d47243b87514ddbfda6a633bd7765a7ef3870f2b0a0b0