Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab026c5e4abfd78b…

MALICIOUS

PDF

67.7 KB Created: 2021-02-26 18:23:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cdcb19ac4f30f81eaa054a64d5ce0735 SHA-1: dff95b9e1184858b7947c2148e4b85b8dcc7d15c SHA-256: ab026c5e4abfd78b1b62b6ffb490cd7e9b51e257a7b08eb596d5fbaace9e2bcf
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to historical treaty information, likely to trick users into clicking the embedded malicious 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://maypoin.ru/strik?utm_term=what+were+the+terms+of+the+treaty+that+ended+the+war+of+1812+brainly PDF link annotation
    • https://durosokikiw.weebly.com/uploads/1/3/1/3/131379956/19cd8babaabd.pdfIn PDF document text
    • https://vitasexabu.weebly.com/uploads/1/3/0/8/130813400/6327164.pdfIn PDF document text
    • https://fagugirawax.weebly.com/uploads/1/3/4/3/134388021/borex.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/loneve-dabojoraga.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/d581c9f5dfe5aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_600a5b1b63001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389606/normal_602ea9f3852ca.pdfIn PDF document text
    • https://jemogofeti.weebly.com/uploads/1/3/4/0/134042608/3260784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_602039472e83f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vutakeba.epizy.com/38710634499.pdfIn PDF document text
    • http://pavoserelolaw.epizy.com/lomisadisugoxiwemili.pdfIn PDF document text
    • http://fonimegalidoxu.epizy.com/xobagax.pdfIn PDF document text
    • http://mebebuxepok.rf.gd/91209584868.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_off0000cb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB19 5872 bytes
SHA-256: 6c4be41cee0aed998eada93eb1db52f4c9df7f9707858c71c68fe2a3c9277e8f
font_01_sfnt_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 10048 bytes
SHA-256: b0032c00413f9a211cbb21348c6f80fd093ba8dc121047bc91b4e256d2243a8f

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