Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7955b53125022fb…

MALICIOUS

PDF

76.4 KB Created: 2021-04-25 08:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 135920b81ab0a92e77dff39309895400 SHA-1: 7cdba919b6a3c502cc9e7ad433a76dabc87fbab3 SHA-256: f7955b53125022fbf48adbfa310d41b0d426c8c5de098645055a9b377045391b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with the primary one leading to a suspicious domain ('seumenha.ru') that is likely used for phishing or malware distribution. ClamAV and ML classifiers also flagged this PDF as malicious, specifically identifying it as a phishing trojan. The presence of embedded JavaScript further supports malicious intent, potentially for exploiting vulnerabilities or redirecting users.

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://seumenha.ru/strik?utm_term=tipos+de+muestreo+en+investigacion+cuantitativa+pdf
    • https://static.s123-cdn-static.com/uploads/4454163/normal_5fcf8da0c74b2.pdf
    • https://static.s123-cdn-static.com/uploads/4380078/normal_5ff4d9f16f98b.pdf
    • https://cdn.sqhk.co/kutajanode/zEcjaji/infinity_gauntlet_stones_order.pdf
    • https://cdn-cms.f-static.net/uploads/4497359/normal_606bcdae9b852.pdf
    • https://cdn-cms.f-static.net/uploads/4485450/normal_60407737bb1f4.pdf
    • https://static.s123-cdn-static.com/uploads/4450426/normal_5ff2aa771a387.pdf
    • https://cdn-cms.f-static.net/uploads/4392668/normal_600dbb03e2d0e.pdf
    • https://cdn.sqhk.co/nisosawero/gexJEad/birthday_candles_picture.pdf
    • https://static.s123-cdn-static.com/uploads/4375521/normal_5ff2caa28c4dc.pdf
    • https://cdn.sqhk.co/simikitivo/ibRDigO/latest_bollywood_ringtone_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4448719/normal_5fd81a4d9ab92.pdf
    • https://static.s123-cdn-static.com/uploads/4489033/normal_5fc6125e9a57a.pdf
    • https://cdn.sqhk.co/febowozefu/ichenAN/75920696634.pdf
    • https://cdn-cms.f-static.net/uploads/4408997/normal_6045fd3d1f3ab.pdf
    • https://cdn-cms.f-static.net/uploads/4477615/normal_600c80acb0c64.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2903667b-e544-4972-ac7f-e5855aaa9b37.filesusr.com/ugd/2cc660_16d008f4e1ba4856af6521bcf2c79a36.pdf?index=true
    • https://uploads.strikinglycdn.com/files/85146ae3-b197-4a68-8d7f-36c954b19fa0/97984423869.pdf
    • https://uploads.strikinglycdn.com/files/a245c18d-cbb2-4248-9b47-66c581509d39/what_is_pascals_triangle_used_for_in_life.pdf
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_d824cd2641f747eab8b1c6ff7e37fad2.pdf?index=true
    • 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_off0000ebb3.bin
d859a2aa50e3ffa368b4fd5b35058d2c5bbfbcd0d67a10c98192288bce461a17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 5452 bytes
font_01_sfnt_off0000fe34.bin
4eae3966a46a19b83937db98216390c8ab59a38f676554afac1583162a005160		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 11128 bytes

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