Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a538513e012cd1…

MALICIOUS

PDF

78.1 KB Created: 2020-11-22 02:41:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8a5f29a3e27f18c3af0e3f053ab4660 SHA-1: 11dd292c09f8d6875d084bd26d3ec2a444ede2f4 SHA-256: 38a538513e012cd14081f43940ca993e9d0be109154c1f5df84e987b0c8cbf7f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to create a link farm for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier also indicate malicious intent, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to drive traffic to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=telescoping+fishing+rod
    • https://cdn-cms.f-static.net/uploads/4391015/normal_5f93a7ee64350.pdf
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/7535962.pdf
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f94d3aa6eb7d.pdf
    • https://cdn-cms.f-static.net/uploads/4368504/normal_5f8959bc0caeb.pdf
    • https://cdn-cms.f-static.net/uploads/4457320/normal_5fae0c0542a34.pdf
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/7702792.pdf
    • https://cdn-cms.f-static.net/uploads/4424637/normal_5fa8adcac163b.pdf
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f8710e848db6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/minaxigevani/world_war_z_free_movies_online.pdf
    • https://s3.amazonaws.com/tobobowu/strong_workout_tracker_android.pdf
    • https://s3.amazonaws.com/farezelof/jikulabuvosumijazugagaxiv.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_off0000ea88.bin
04d695dbaf354c6db717113a2c92bd40380987877b060d8326c15dfa826f847a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 4864 bytes
font_01_sfnt_off0000faf7.bin
72dfcece7d7612e0609cd476dd35b71a5f140b2881187ef607e702699dc8265d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 10292 bytes
font_02_sfnt_off00011df1.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 4324 bytes