Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a6f873d1335876…

MALICIOUS

PDF

75.1 KB Created: 2021-02-24 17:19:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 026a76efed7144b277e1fb2bba5f5dda SHA-1: 4b98170611495469cf086fc785776ddffcbb85cf SHA-256: f2a6f873d133587694c228a3d7e617e550866150976720e2176cc27def0c83ef
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=solving+two+step+equations+and+inequalities+worksheet+answers
    • http://epaytds.xyz/birthday_cake_recipes_easy1r681.pdf
    • http://bcpzonasegura10beta-viabcp.com/69741500893sw0ha.pdf
    • http://delaem-sami.online/sedonumasoxinixuluguzoqm74v.pdf
    • https://golotarati.weebly.com/uploads/1/3/1/8/131856611/5820939.pdf
    • https://dazutexigamufo.weebly.com/uploads/1/3/2/7/132740900/zafilipo.pdf
    • http://safijejog.mygamesonline.org/jajig.pdf
    • https://danonifakusore.weebly.com/uploads/1/3/1/4/131483465/fcbe60a4395343.pdf
    • https://cdn-cms.f-static.net/uploads/4476765/normal_600da928d74d1.pdf
    • http://neuroncraft.online/bojexugirovijodagexuwul5ud0h.pdf
    • https://viduturuv.weebly.com/uploads/1/3/6/0/136082320/8519814.pdf
    • http://7lessons.fun/xodemadupekeyebcm.pdf
    • http://akmurzina.com/sexefudozefijelipojimowe05jlk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/luxaduzimase/sunisof.pdf
    • https://s3.amazonaws.com/jedaxopopuko/naxesudubodosuzopame.pdf
    • https://s3.amazonaws.com/pibajuwi/technical_mathematics_questions_and_answers_grade_10.pdf
    • https://s3.amazonaws.com/zozofufulolig/high_graphics_android_games_free_apk.pdf
    • 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_off0000e696.bin
99434972305f2efa80e58454e0c2a08faee147c94b625fe3a7275d8e91c12d88
pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 5668 bytes
font_01_sfnt_off0000f9ea.bin
d8aa7436349d8cc36ea3356436fd20360f16881b6e12d237c9379daa81c176f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EA 10876 bytes