Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35ec3c9cb6410ec…

MALICIOUS

PDF

122.1 KB Created: 2021-03-27 22:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e470eeab9280ccd44ef17c5e188cdc21 SHA-1: 1f8fde98b0d723bb3948f93cd4c95e04657504d7 SHA-256: b35ec3c9cb6410ec63e3f8e64da0f36fe16dc1e7d78526844b8b6fb87d5387b6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links, with a significant number pointing to other PDF files. This suggests a tactic to distribute further malicious content or conduct phishing operations. The presence of external URIs and a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://kuzutuzo.ru/aws?utm_term=what+is+legal+age+of+consent+in+america PDF link annotation
    • http://auth02mobility.com/jamupiworomejonivaf5v.pdfIn PDF document text
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/c9ceb2.pdfIn PDF document text
    • https://wipigoxexidon.weebly.com/uploads/1/3/2/6/132682030/menizuragutered.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/ciqjahj/76472798040.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/jegj1XW/jijujoridamalogavasozar.pdfIn PDF document text
    • http://krym.today/62425986544rd9or.pdfIn PDF document text
    • https://pibezenasa.weebly.com/uploads/1/3/1/4/131454503/tufadobinexugabaximo.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/eKgSqhd/fewutikat.pdfIn PDF document text
    • https://kodavagimiwebod.weebly.com/uploads/1/3/5/3/135346487/8002162.pdfIn PDF document text
    • https://cdn.sqhk.co/sologavabo/jKhbsqM/kewewud.pdfIn PDF document text
    • https://cdn.sqhk.co/noruwotil/igyLJZg/benefosadebopurewawiwe.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/mubemutolewe/chick_fil_a_app_free.pdfIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_05613bf15d2b46c08685a498b753b12c.pdf?index=trueIn PDF document text
    • https://79ab8074-8148-4faa-9219-f6cdfa35bc15.filesusr.com/ugd/99e004_0c62db93144d447d8695669fe3d5fb65.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_5e6257d14e2a4f098806e85ff991cf96.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zunaporam/aankhein_teri_kitni_hasi_audio_pagalworld.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_5ecd5c14af1a4744bc22eefd381f8dd0.pdf?index=trueIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_867b12c3a6434abb90c590200f2efe8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokit/travel_packing_checklist_template_word.pdfIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_2c2d456a0b084cc29f7dc5d59774f439.pdf?index=trueIn PDF document text
    • https://9462281c-6212-45c1-8f90-c4e3c363a226.filesusr.com/ugd/007d40_0390bea40eb54370ab72863ffc40cf20.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/82405831865.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/lonurefix.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_128f7773c84c4c4c88e13bb709033e8c.pdf?index=trueIn 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_off00019e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E3F 5308 bytes
SHA-256: 803cf9a373355fe16b079e5fedc479f2574e4ea7299f0d0d372eba4127134d00
font_01_sfnt_off0001b034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B034 12448 bytes
SHA-256: ded0e87077ed3c7d982b00846adf9e4b29157bdf07958e0352cfa1e1c1570b56

Open this report in the interactive analyzer, or submit your own file for analysis.