Malicious PDF — malware analysis report

Static analysis result for SHA-256 e348fb2069392f0f…

MALICIOUS

PDF

88.5 KB Created: 2021-03-24 21:20:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31b815c49204a454f1779095f71f8123 SHA-1: 59e7ddf71cd8f4518e7e7d9d8691453d6a2f8de6 SHA-256: e348fb2069392f0fbe49a6f5c5e59d4802dbde207bd73b6987cdfaf0a2bea160
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a method to obscure malicious content. The presence of a URL like 'https://vilenefex.ru/123?utm_term=whatsapp+apk++new+2018' indicates a potential lure for users searching for specific applications. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://vilenefex.ru/123?utm_term=whatsapp+apk++new+2018
    • https://cdn.sqhk.co/fugovigul/c8Whdhh/99155993574.pdf
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/5547878.pdf
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/143a03243.pdf
    • https://cdn.sqhk.co/jupozaregu/o4hfrMu/kingston_clippers_soccer_fields.pdf
    • https://cdn.sqhk.co/batumozi/AghVfhg/jowawudi.pdf
    • https://cdn.sqhk.co/boketumejipa/jbhbXe5/zombies_2_werewolf_costume_wyatt.pdf
    • https://cdn.sqhk.co/zozimevoket/jtL6ie2/fuzedopivamobuputaw.pdf
    • https://cdn.sqhk.co/gepeduvo/dhhh3ie/80108579346.pdf
    • https://kovirelumen.weebly.com/uploads/1/3/0/8/130873776/9130959d1f9.pdf
    • https://cdn.sqhk.co/ledodatefu/dggfWii/sawixibe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/roware/azar_modded_apk_3._5._6.pdf
    • https://s3.amazonaws.com/liguwubore/vavugevoralubin.pdf
    • https://s3.amazonaws.com/nefomojuwet/citrix_receiver_mac_catalina.pdf
    • https://s3.amazonaws.com/popisiburewixuj/what_does_it_mean_if_your_crp_and_sed_rate_is_high.pdf
    • https://uploads.strikinglycdn.com/files/7bafce1b-46dd-4001-ad82-ba52a61c1a94/r_programming_language_logo.pdf
    • https://s3.amazonaws.com/dubiditiginowo/chronotherm_iii_installation_manual.pdf
    • https://uploads.strikinglycdn.com/files/b333df11-438a-4ed4-b4a0-2d305e97a527/data_warehouse_interview_questions_folks_talk.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_off000119ac.bin
9ecbc50410a8917d8811cbd4ca3d8c9e692106f7dbac14c7bd43dee31c40252c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119AC 5468 bytes
font_01_sfnt_off00012c5f.bin
b0a1fb8e0f26b45460048af4483b7b2f14be00c8554507f1ff6e12e2dbc2db17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5F 11876 bytes

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