Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ac60439547fb11…

MALICIOUS

PDF

61.6 KB Created: 2020-12-03 20:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22fad23d344c7db46dc43c14c4799507 SHA-1: 125c8a8477ee50d7f60e38e0a9bdf891c0c46624 SHA-256: e4ac60439547fb11261982292386cae18d12b2ba4e9d5617f80578700f0f649c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of external links, with a heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URLs identified are trafffe.ru and a weebly.com subdomain, suggesting a phishing or SEO spamming campaign.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/123?utm_term=6+zones+of+off+screen+space
    • https://bejasesazopo.weebly.com/uploads/1/3/4/5/134512805/6936122.pdf
    • https://cdn-cms.f-static.net/uploads/4379043/normal_5fb561644b5ac.pdf
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/8131039.pdf
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/67db1b6fb4992d.pdf
    • https://pasifoberili.weebly.com/uploads/1/3/4/8/134881239/6671772.pdf
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/fagozuzir_ledek.pdf
    • https://ruwuzeget.weebly.com/uploads/1/3/4/7/134755445/4762171.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jivamubug/lutebiloto.pdf
    • https://s3.amazonaws.com/zufaxepixiguxax/lafivevipabokum.pdf
    • https://static1.squarespace.com/static/5fc0d4086b97992eb55bb7f9/t/5fc48d73145a8629dc424588/1606716787503/bezoditazapesi.pdf
    • https://static1.squarespace.com/static/5fc0c8f51452f90b7fe4c8fc/t/5fc18cc4a97599144e323a02/1606520006784/rugaj.pdf
    • https://s3.amazonaws.com/gewisetug/how_to_become_a_vampire_lord_in_skyrim_v.pdf
    • https://static1.squarespace.com/static/5fc27b9b88c99b6d37b1408e/t/5fc67dd84e98326c02f2b027/1606843864955/19962344259.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf54d661e25426e12f879c/1606374614751/46156385254.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_off0000b762.bin
687e30b80c187c9ce4329679d341f66d25ab6a03c5f25482b32fcc365f8d2e14
pdf-font-stream PDF embedded font (sfnt) at offset 0xB762 5084 bytes
font_01_sfnt_off0000c8c5.bin
7f2f3b332669abe06af42bd752d3a2823efac5f81d21bc8bf38536f18e017551
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C5 9300 bytes