Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a16e82dabbde596…

MALICIOUS

PDF

88.7 KB Created: 2021-06-07 05:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c7f74c8524d7007f04882cd2224aa2aa SHA-1: 01437effccb9687f933aa50a007c7315d13826bb SHA-256: 5a16e82dabbde5969e2899303558115e90dd52b552e039da927f67142ef393b8
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation scheme. One of the embedded URLs, https://irlanc.ru/pbw?utm_term=eu+augusto+dos+anjos+pdf, is particularly suspicious and likely leads to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8218

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://irlanc.ru/pbw?utm_term=eu+augusto+dos+anjos+pdf PDF link annotation
    • https://dijafujuzu.weebly.com/uploads/1/3/4/3/134369935/sibav-wolexexidemowip-loxulozewimileg-pewudilaziruban.pdfIn PDF document text
    • https://tenuwikenosex.weebly.com/uploads/1/3/6/0/136082269/kodananadavugi.pdfIn PDF document text
    • https://potomifor.weebly.com/uploads/1/3/4/3/134332951/kemawiru_tifowikeg_pagutonu_sezesedil.pdfIn PDF document text
    • https://xajupodesuze.weebly.com/uploads/1/3/1/3/131380723/devasududena.pdfIn PDF document text
    • https://memudodonimik.weebly.com/uploads/1/3/1/4/131406547/c35e581308477e.pdfIn PDF document text
    • https://niremavepuna.weebly.com/uploads/1/3/4/6/134625676/78f907.pdfIn PDF document text
    • https://bokesaxigalul.weebly.com/uploads/1/3/0/7/130776824/zafopirite_gumoweza_xurufakurugemi_raboma.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/989e4f71-9f47-4af6-9f02-983541d11842/dark_knight_returns_batman_kills_joker.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/w/file/fetch/144462651/lusaratagolotadotog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd350460-cbe5-4f60-9e3a-63c8d540b8b5/examen_de_diagnostico_para_primero_de_secundaria_historia.pdfIn PDF document text
    • http://doxawadar.pbworks.com/f/woxidudovu.pdfIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144604641/absolute_zero_kelvin_scale_worksheet_answer_key.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/f/11353628179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff81c8e-f1f4-43ac-8236-fd66b3d36d56/1598113846.pdfIn PDF document text
    • http://nigezid.pbworks.com/f/nujagugisakiganetidapinu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf67191-1fd5-415d-8643-a413f62ea1e8/24890269428.pdfIn PDF document text
    • http://zuvuwiro.pbworks.com/w/file/fetch/144725910/kidde_nighthawk_carbon_monoxide_alarm_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c61f613-5589-4ab5-839b-0f9d56b9c733/82827697428.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE4 5112 bytes
SHA-256: 885e600f998c40aa07935106a3cbbabac09e08d7be3ae758c1f2a21406ffa681

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