Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80db6d04fab8f18…

MALICIOUS

PDF

76.1 KB Created: 2021-03-01 00:51:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b47414827fb218dd862082ba7d5930a3 SHA-1: 50123ecb7062abc8cd73ad03f5e401c1d7bd61d6 SHA-256: d80db6d04fab8f18b6138e6b733613dd66ff3c923b4d13645a37342658197d50
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a search result or content page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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/wix?keyword=read+queen+of+shadows+by+dianne+sylvan+online+free PDF link annotation
    • https://cdn.sqhk.co/zedazisem/bjhqiih/19726532998.pdfIn PDF document text
    • http://opensol.xyz/haywired_scenario_factsheet7nx8w.pdfIn PDF document text
    • http://kemotunitajifap.iblogger.org/66711891006.pdfIn PDF document text
    • https://cdn.sqhk.co/kokademesuz/ighYTo7/16511377574.pdfIn PDF document text
    • http://org-fruit.space/xorugdimv6.pdfIn PDF document text
    • http://nesobaka3.xyz/rhyming_dictionary_app_for_androidbxzbp.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/24jjif7/91855068899.pdfIn PDF document text
    • http://dutov.org/beige_because_i_miss_you_instrumentalsipv2.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/kIjiiix/blood_money_lyrics_protoje.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/Vvvejad/74269870512.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vetuvadoxawiton.epizy.com/5272761751.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/84666798552.pdfIn PDF document text
    • http://karelovaluz.epizy.com/subordinating_conjunctions_worksheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 5324 bytes
SHA-256: 24a70cd1ef0a5cc83927ed76ef91ce649e6cbad8dba4f4547c7ed6b0f0ed8b18
font_01_sfnt_off0000f179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 10260 bytes
SHA-256: 303850cb100438268e6b71885de0c89b0ba79e7720c9783068e8da76856c4e70
font_02_sfnt_off000114af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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