Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c1d6d70b257a04…

MALICIOUS

PDF

67.0 KB Created: 2020-12-17 12:57:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6969938bf9cfb4eb19562295c0ee6773 SHA-1: 83833ca2587a7b5531a5cbe3c2ab9c9504073416 SHA-256: f7c1d6d70b257a0403a3f51c8396a710a375b1a41951d693fe781f0b8a08be03
214 Risk Score

Malware Insights

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

The PDF contains a link farm and redirects to a known malicious URL, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the embedded URLs and heuristic firings point to a malicious redirector and link farm, likely used to host or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/strik?utm_term=annotated+bibliography+examples+chicago+style
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/43ec7e21c5.pdf
    • https://rodekimixew.weebly.com/uploads/1/3/4/3/134314341/3d67a5dcaa1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fe38d1bb-4f33-4894-ba2b-d293affecf05/68840222596.pdf
    • https://s3.amazonaws.com/fulomufimikim/minecraft_buildings_guide.pdf
    • https://uploads.strikinglycdn.com/files/fcb45c06-960f-49b8-b310-cf4c898e0dbd/avabel_warrior_guide.pdf
    • https://static1.squarespace.com/static/5fc66fe517e72026400ff170/t/5fd135b20e16cf6799604e5e/1607546291581/download_smurfs_bubble_story_mod_apk.pdf
    • https://s3.amazonaws.com/petubapizo/23439612658.pdf
    • https://uploads.strikinglycdn.com/files/085e8b57-09ae-4387-ba52-3864637f23ad/wezikatoxusevuzap.pdf
    • https://s3.amazonaws.com/sakaburepagase/viber_iphone_old_version.pdf
    • https://uploads.strikinglycdn.com/files/c167b6b1-ea4b-4ba1-959c-1fa6d2e3203f/muwubumulowutadubef.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_off0000c98b.bin
03a3c66f8df89cd5a6418a314aec75df299272b268a93728ce6d71b31ab79e56
pdf-font-stream PDF embedded font (sfnt) at offset 0xC98B 5784 bytes
font_01_sfnt_off0000dd21.bin
c7385b14e83b10507033047d87c2e3a813d43114438ab64cb90f71c00a64ec92
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 10024 bytes