Malicious PDF — malware analysis report

Static analysis result for SHA-256 8adecad826a0045b…

MALICIOUS

PDF

65.4 KB Created: 2021-02-18 10:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d618ab2577944d2b5db2b2531a216070 SHA-1: e5e073052ae267f2e25ca628ffe0884dc0191468 SHA-256: 8adecad826a0045bae8684fc175dd6f8b50e4bf200f82cd767fe77c88354e5f1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this file as malicious, with a critical heuristic identifying it as a link farm. The primary purpose appears to be directing users to potentially malicious or unwanted content through a network of redirecting URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=introduction+to+flight+8th+edition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426679/normal_5ff4cb5312e55.pdfIn PDF document text
    • https://vafukomoruf.weebly.com/uploads/1/3/4/8/134862603/zelit-kepokusufoxomix-tinenetepe.pdfIn PDF document text
    • https://lezevonunibo.weebly.com/uploads/1/3/4/5/134577944/a3019eaf483.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/9297694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405674/normal_601673b0d199a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464995/normal_5fcecfae9a1d2.pdfIn PDF document text
    • https://kusebavizekofuk.weebly.com/uploads/1/3/4/0/134098677/417c7f400.pdfIn PDF document text
    • https://vidimepimexuja.weebly.com/uploads/1/3/4/6/134626803/lazenezep-lozijaxugasux-weforovavul-dudez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383340/normal_5fe96fa3a6bf5.pdfIn PDF document text
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/nusufowuju-lebeg-lekikekutade-minobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501193/normal_602c88a36a97f.pdfIn PDF document text
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/84f0f8a.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/wikodugoder_lilero.pdfIn PDF document text
    • https://vipozuguru.weebly.com/uploads/1/3/1/4/131483083/002a37c1c.pdfIn PDF document text
    • http://vitrinachel.ru/badtameez_dil_mp3_free_download_320kmwtia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482860/normal_5fdea46c66ea5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451348/normal_6008933a1f82c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vadepik.epizy.com/adb_install_apk_command.pdfIn PDF document text
    • http://losamipivoku.epizy.com/poisonous_flammable_gas_crossword_answer.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_off0000c131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC131 5028 bytes
SHA-256: ac3ad27a606a4ebf16257c66c5b155d5151a21305d12fde3bacdbdaa97e4890c
font_01_sfnt_off0000d24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24B 11224 bytes
SHA-256: a9f64771824dda1ec203da1e65f02b4632b168360b31bdc8d915abe33e7ecf9f

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