Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9794e4deac27219…

MALICIOUS

PDF

82.8 KB Created: 2021-05-18 00:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f90e0dbce3df1f07e1ff329367b2f7b SHA-1: addf543b9cb4f5eb070f3a8529b629c07e0d4ed3 SHA-256: a9794e4deac27219656281631a8326eaa539c19b5abdad1bbb7c12b957307334
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, and it contains numerous external links, indicating a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_LINK_FARM heuristics strongly suggests the document's primary purpose is to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to lead users to external content.

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://gimoguvi.ru/strik?utm_term=sultan+luroy+ikea+bed+instructions
    • https://static.s123-cdn-static.com/uploads/4485451/normal_6005890ddfdcb.pdf
    • https://cdn-cms.f-static.net/uploads/4379612/normal_60525c6a13cf6.pdf
    • https://cdn-cms.f-static.net/uploads/4412159/normal_601f9f28a7951.pdf
    • https://cdn-cms.f-static.net/uploads/4383452/normal_5fd76ed0a623c.pdf
    • https://wilulesutazi.weebly.com/uploads/1/3/3/9/133997377/lukemab-rarimuzenuvasad-bezik-zolemojubeline.pdf
    • http://pamuxixa.iblogger.org/what_is_energy_stored_in_plants_called.pdf
    • https://cdn-cms.f-static.net/uploads/4384642/normal_604922898d786.pdf
    • https://static.s123-cdn-static.com/uploads/4407813/normal_5fdf56e5e68b4.pdf
    • https://winofugunolef.weebly.com/uploads/1/3/4/8/134846497/1a903aa1a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wiwuxot/mcgraw_hill_pre_algebra_textbook_free.pdf
    • https://s3.amazonaws.com/dibedamoka/willy_wonka_and_the_chocolate_factory_song_lyrics.pdf
    • https://s3.amazonaws.com/zedudo/calibri_font_mac_os_x.pdf
    • https://s3.amazonaws.com/votawawo/58554965695.pdf
    • http://kixajek.epizy.com/download_adobe_reader_for_windows_10_free.pdf
    • http://tapanowi.epizy.com/base_de_dados_2.pdf
    • https://s3.amazonaws.com/jedaxopopuko/padaxipeloxefixosefawiv.pdf
    • http://bokatamekal.rf.gd/livro_aristoteles_metafisica.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_off0000f75b.bin
6b402f9cc77f7bf4c1896a3509697c2e3ed26eee39506a27a9a65395b542f2eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 5224 bytes
font_01_sfnt_off00010927.bin
f8c8e8124f6cd8e034dff6747c094f66418f6f8839c8cdd6a89fcd94de0d2778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 11404 bytes
font_02_sfnt_off00012fc1.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC1 4324 bytes

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