Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac66a3cee035e8b8…

MALICIOUS

PDF

74.9 KB Created: 2021-01-07 20:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 59a437a639fae994c5b87503a51ed128 SHA-1: e55b4a4675f09d237305c2079a6ddc94f8bc6fb9 SHA-256: ac66a3cee035e8b88db3441fc6940b82c3ae63c5f27f87cd64ce85578dbc0508
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to Android applications, aligning with a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/aws?utm_term=bebop+drone+android+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5f98d2d4e5723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447646/normal_5fe98cce711a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5fe77bb869334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f9364a417e9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f9c802899719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5f8a4eb400e7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/varolexexus/jadexanij.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/sunejevetinilirakege.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/difference_between_android_and_iphone_headphones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e2f007-6f32-4dd7-a32e-0a1d4d600519/39611972348.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/impedance_matching_transformer_for_speakers.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/android_online_emulator.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/hacksaw_ridge_movie_720p.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_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 4932 bytes
SHA-256: b85cf987850cf8a35c654fab4e8113d9b48a300d67f2e3b114871142e6604d16
font_01_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 10588 bytes
SHA-256: 19401477adbda2302edf05978750075f4b0cf9a4e08ca622550f4b60263a5e95