Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f90439ab375bf9…

MALICIOUS

PDF

59.8 KB Created: 2020-11-25 14:33:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81251b0dec2eb488bba1ffab4d64d512 SHA-1: d98a5c638ee1b4ae048a21fae2e320a08f5a9038 SHA-256: 15f90439ab375bf9cca1db3c6ab7af429a84efd5847c96a29d5474eb3dfaf1b7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or redirection scheme. The document body is heavily obfuscated and appears to be a lure, likely intended to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/aws?utm_term=dadagiri+googly+questions+with+answers+bengali
    • https://digaporabanezaf.weebly.com/uploads/1/3/4/6/134689005/vudisij.pdf
    • https://xibogunef.weebly.com/uploads/1/3/1/3/131398295/bugan_mekaj.pdf
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/wuropu.pdf
    • https://cdn-cms.f-static.net/uploads/4384644/normal_5f94d41921897.pdf
    • https://giboramogu.weebly.com/uploads/1/3/4/6/134627050/jaled.pdf
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/3e75a4e696b2f2d.pdf
    • https://zukedobawalot.weebly.com/uploads/1/3/4/5/134526307/cc554ae6.pdf
    • https://punadojum.weebly.com/uploads/1/3/2/6/132680976/1598612.pdf
    • https://kubuwexujilo.weebly.com/uploads/1/3/4/4/134473085/9123397.pdf
    • https://vokewubepil.weebly.com/uploads/1/3/4/4/134443825/kisusetonaxorinonu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/be04600a-ed4a-47f9-9094-8b79204940f9/monument_valley_game_free_download.pdf
    • https://uploads.strikinglycdn.com/files/590d19a1-6046-4d55-9aa6-ee9e0b733332/31331923795.pdf
    • https://uploads.strikinglycdn.com/files/2faa0377-14c2-4598-ab2c-d5c1c34fb2d8/naparima_cookbook.pdf
    • https://uploads.strikinglycdn.com/files/8809220c-13d9-4802-b614-79e6bcc8962f/wufabafaremewuvinivakij.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_off0000abd8.bin
c49e3f28c10fb1d037845d1357541111a76e4e16cb0b47d3036961f6a050a0be
pdf-font-stream PDF embedded font (sfnt) at offset 0xABD8 5544 bytes
font_01_sfnt_off0000bec0.bin
25e7c45f58275af0f4eccd43783f2d4b4b3ee9dd357df5e12bbc8a7f733546a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC0 10472 bytes