Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4654fec4163df1…

MALICIOUS

PDF

78.6 KB Created: 2021-04-12 23:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7068274f44a889335a6caa5860ee4b1e SHA-1: e2badcc372950c08da864280af01e59f0bab5ab4 SHA-256: 1d4654fec4163df1d673103b87a3f16090e22e303ab26cc445cc07ef1e1c50b3
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, with one prominent URL pointing to a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a lure related to comparing artists, likely a pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=how+to+compare+and+contrast+two+artists PDF link annotation
    • http://mini-cam1.club/mx_player_apk_download_20155s7ju.pdfIn PDF document text
    • https://bevufivob.weebly.com/uploads/1/3/4/6/134669401/lisabope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495040/normal_60328cfb6a29f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499979/normal_5ff413f794b24.pdfIn PDF document text
    • https://lipixikipated.weebly.com/uploads/1/3/0/7/130776445/f96c90632cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_602b64e339a1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_6021c7213e964.pdfIn PDF document text
    • https://malilojomatade.weebly.com/uploads/1/3/4/3/134354128/vavafarudofigupef.pdfIn PDF document text
    • https://sozumibazukupiv.weebly.com/uploads/1/3/4/7/134735026/1725968.pdfIn PDF document text
    • http://thecet.xyz/jakexu4v78i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491665/normal_5ff23977e62dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448744/normal_606e0e72b4f8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofiketur.rf.gd/bupifefonatud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6a6f3d0-8897-41b3-bff5-407d497cf931/can_you_charge_a_trolling_motor_battery.pdfIn PDF document text
    • http://kajonamopesubom.rf.gd/69065405934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2253a28-841f-4775-9521-58d9b0989469/78658210606.pdfIn PDF document text
    • http://sufimajedunof.epizy.com/28716800185.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 5240 bytes
SHA-256: 13fb5e93d63b488109af32adbc51a7173666eb6d1136462e2135c2613e58270a
font_01_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 11984 bytes
SHA-256: 63464ce9e1cf5e7aa26c81d02382ef55ce16ffa9f93e3dd8c411ff265f60edf3

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