Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f93b76f47a22f86…

MALICIOUS

PDF

79.9 KB Created: 2021-01-05 20:09:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 722dac14143f61e4188862882cd2425b SHA-1: 7d9dcf04615d1abe531a0e4ca2397408c75bcc3a SHA-256: 2f93b76f47a22f86fb1da54209ae76c5b93192f16b40c7f48d62cf298ab633f4
214 Risk Score

Malware Insights

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

The PDF contains multiple links, including one pointing to a known malicious redirector infrastructure. The embedded content, though heavily obfuscated, suggests an attempt to trick users into downloading software. The presence of numerous external PDF links also indicates a link farm, likely for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://cctraff.ru/aws?utm_term=antivirus+software+apk++for+pc
    • https://gakofalu.weebly.com/uploads/1/3/1/6/131636889/7990062.pdf
    • https://xirofepomare.weebly.com/uploads/1/3/0/8/130814083/6615089.pdf
    • https://static.s123-cdn-static.com/uploads/4456134/normal_5ff416962bf71.pdf
    • https://static.s123-cdn-static.com/uploads/4489983/normal_5ff115e983607.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gazitif/policegiri_chura_ke_leja_ringtone.pdf
    • https://s3.amazonaws.com/zupenafud/nfsi_study_guide_free.pdf
    • https://s3.amazonaws.com/ragejufa/diboratinalegipi.pdf
    • https://s3.amazonaws.com/pasawe/pitanuzavaxipedixovexog.pdf
    • https://s3.amazonaws.com/xupimaral/pathfinder_kingmaker_metamagic_rods.pdf
    • https://s3.amazonaws.com/xuxifuzituwu/vatican_private_tour_guide.pdf
    • https://s3.amazonaws.com/pizexopenaxu/chori_chori_old_movie_song_free.pdf
    • https://s3.amazonaws.com/bezegoluzose/animal_management_level_3_revision_guide.pdf
    • https://s3.amazonaws.com/zirojopemup/janesir.pdf
    • https://s3.amazonaws.com/kelukakeb/nadamotuwiworu.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_off0000fe84.bin
c72ad880b4f7f9d9d85843ffe6be2c05ea8b667af1973e538582ea5a7c8f9d17
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 5180 bytes
font_01_sfnt_off00011051.bin
6f67b7a9e9d861664a9371b48933513a47522c781746bdcf606a563e5a4768a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 10240 bytes