Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c73c0d27798b632…

MALICIOUS

PDF

78.1 KB Created: 2021-02-22 11:23:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52330332add0f2f5358744d2330a0e30 SHA-1: 0c4b92bbab27065bb8b273ab8f20caed61c01a12 SHA-256: 4c73c0d27798b6320203b57ffb70d3ced424d7c0631a3f683a22530a0c4bf0a6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URIs, with a primary focus on `http://bitesokilok.epizy.com/update_mysql_database_php_form.pdf` and `https://leonvi.ru/123?utm_term=aircraft+maintenance+engineer+job+in+canada`. The presence of a link farm suggests an attempt to manipulate search engine results or redirect users to potentially malicious content, aligning with phishing or SEO spam tactics.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=aircraft+maintenance+engineer+job+in+canada
    • https://zidepodip.weebly.com/uploads/1/3/0/7/130775192/zukufejupizule_rezurap.pdf
    • https://cdn-cms.f-static.net/uploads/4454170/normal_5fd71852321c7.pdf
    • http://tedisesux.22web.org/makiwatusek.pdf
    • http://wisecredit.info/746610761064pou4.pdf
    • http://noverst.xyz/jeniwuzujubuzozowujewajt6i3.pdf
    • http://wexixexebasober.22web.org/bewenatetufuxunir.pdf
    • https://cdn-cms.f-static.net/uploads/4483851/normal_6022c7b19f134.pdf
    • http://teren.fun/boxunezurotujprqi2.pdf
    • https://static.s123-cdn-static.com/uploads/4446027/normal_5fca293451093.pdf
    • https://cdn-cms.f-static.net/uploads/4381082/normal_601fda55a8155.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bitesokilok.epizy.com/update_mysql_database_php_form.pdf
    • https://s3.amazonaws.com/liguwubore/26417036333.pdf
    • http://nazonuretowu.epizy.com/72568338546.pdf
    • https://s3.amazonaws.com/sezewu/haier_12_000_btu_portable_air_conditioner_and_heater.pdf
    • http://pipinodojo.epizy.com/facebook_ads_guide.pdf
    • https://s3.amazonaws.com/lofese/highmark_bcbs_medical_policy_guidelines.pdf
    • https://s3.amazonaws.com/xidulumexi/86306382023.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e401.bin
f721af699f08881968784b7e2df518431fd4b2248cc0d46af573d2bc39d45a57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE401 5124 bytes
font_01_sfnt_off0000f545.bin
ab718e9d29566008f97682522bade7aa62a26febadef4dc491abf8e219f0142f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 12032 bytes
font_02_sfnt_off00011cd7.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD7 4324 bytes

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