Malicious PDF — malware analysis report

Static analysis result for SHA-256 36acaa566453671d…

MALICIOUS

PDF

81.8 KB Created: 2021-05-30 14:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 82512ffddb48becf9171fcb331c705ed SHA-1: 41c858097e1a7a0841fe7477f159710453cd4271 SHA-256: 36acaa566453671d5eda2b372118acd354667809a72ea96738aa23958b6b8a10
186 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The embedded URL 'https://mezovuduw.ru/strik?utm_term=aptoide+apk+for+windows+10' indicates a lure related to software downloads, likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=aptoide+apk+for+windows+10 PDF link annotation
    • https://powipawi.weebly.com/uploads/1/3/4/3/134313445/5182119.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377662/normal_5ffc5aa6f33ee.pdfIn PDF document text
    • https://boziwigezuzes.weebly.com/uploads/1/3/5/9/135984517/df97d2989976c0d.pdfIn PDF document text
    • https://boxavukexuzar.weebly.com/uploads/1/3/0/7/130775797/doxow.pdfIn PDF document text
    • https://sopunarexij.weebly.com/uploads/1/3/1/8/131857112/pamefuruda.pdfIn PDF document text
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/1146165.pdfIn PDF document text
    • https://famewuguwol.weebly.com/uploads/1/3/4/7/134700343/bivelavagudo-xijozuwowori-pokeluxerirozev-gogatitew.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/rusujexakevis.pdfIn PDF document text
    • https://setowunujabid.weebly.com/uploads/1/3/4/0/134095848/jefawipozanezos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452865/normal_5ff875b500658.pdfIn PDF document text
    • https://zokejiwiperasuk.weebly.com/uploads/1/3/4/6/134668939/guxisulamator.pdfIn PDF document text
    • https://mazokozofifux.weebly.com/uploads/1/3/4/3/134305155/lopakiw-zukus-xesebavetupew.pdfIn PDF document text
    • https://vixikuladiwepev.weebly.com/uploads/1/3/0/7/130738731/9c61de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486359/normal_5fec44d109020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8da29d-1e50-4039-ba50-958421a56ae9/wigozozaneserixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df4f9ef-1495-4be9-bb86-bf457f19f124/aol_instant_messenger_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c77e615-0d3e-4018-af20-75388580289b/gubopapunokivilupaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee245d5e-c51a-49a9-981e-04088e84a4ad/39028142595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e6b2e81-23ee-4fdd-a664-99e86f912202/bonenaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bbe5f84-7cf5-42e8-be4e-438fa8976611/55283070732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a727ab9a-96a2-440c-986f-2f327587d643/zebra_gk420d_ip_configuration.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_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 5344 bytes
SHA-256: a984d6c83d3b095fda76901821a5b89cdeab53b67b74bca0ff90672dd4839c3e
font_01_sfnt_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 16128 bytes
SHA-256: 0882980e6f3e58cb70a3e9cd40eba704226869310987dcd820773daef4f987d3