Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7bf798f2de5ab0…

MALICIOUS

PDF

65.5 KB Created: 2020-12-22 23:54:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3744b52773c747bc8a59ff30be260a18 SHA-1: 16eb097d3189bb1f7bc26e53e24aba4c41fcc0af SHA-256: 9a7bf798f2de5ab04a9f602ef80d52d027b81b3650ecddfeab90ea6f0b1a265c
156 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a suspicious domain, identified as a potential phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/strik?utm_term=colour+wheel+app+iphone
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/4929228.pdf
    • https://static.s123-cdn-static.com/uploads/4491414/normal_5fcb3fcea0595.pdf
    • https://kudizuvawemexol.weebly.com/uploads/1/3/4/3/134307781/2716873.pdf
    • https://static.s123-cdn-static.com/uploads/4465131/normal_5fcd80c875d07.pdf
    • https://static.s123-cdn-static.com/uploads/4370529/normal_5fce9383be657.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc0e0f3f7cf8c75402ad020/t/5fc10eb0a97599144e1cc268/1606487729796/chapter_12_molecular_genetics_assessment_answers.pdf
    • https://static1.squarespace.com/static/5fc52335cd1e280355efa049/t/5fcced7c978da30c56fe1070/1607265661175/birthday_party_decor_ideas_for_adults.pdf
    • https://s3.amazonaws.com/folexapurilowe/89759098096.pdf
    • https://uploads.strikinglycdn.com/files/2d50d9d6-2973-405e-93ab-1791f7094f53/simbologia_de_instalaciones_neumaticas.pdf
    • https://uploads.strikinglycdn.com/files/f7fdad77-c3ff-4f03-96f9-e866c4658acd/zibowi.pdf
    • https://uploads.strikinglycdn.com/files/d764c027-0a54-40fd-ae53-9abdc5a0b11f/14469199173.pdf
    • https://s3.amazonaws.com/vukusa/class_11_physics_textbook.pdf
    • https://s3.amazonaws.com/lanorolowu/71710887873.pdf
    • https://uploads.strikinglycdn.com/files/3c53121e-fbd4-4f39-bfeb-94df97d29a15/wow_macro_castsequence_target.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_off0000c4ec.bin
c0eef1d8a77a4ed1fa694ac211a2766fe1e5b392ac320bec02e4f5bc291ccfba
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EC 4724 bytes
font_01_sfnt_off0000d500.bin
94ba362ba85c2c65a1239f337ea045af1d8a8caac3a0adffac7e4fceb7668544
pdf-font-stream PDF embedded font (sfnt) at offset 0xD500 10492 bytes