Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97ed3adeae38552…

MALICIOUS

PDF

64.5 KB Created: 2021-02-26 09:30:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3edd96e1a58e7f9c9fec76fb5f369ddd SHA-1: 6685ed3abd6ae130dfcc868fbf757afcb9849425 SHA-256: c97ed3adeae38552eb154ab6df3f7c4acb144d88d8994f6cc6f75817402112f8
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, suggesting it functions as a link farm or redirection mechanism to potentially malicious sites. The document body, though heavily obfuscated, contains text related to 'word search' and 'answer key', likely a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=word+search+expresate+level+1+answer+key PDF link annotation
    • http://tekufebuxu.iblogger.org/how_much_does_a_smart_bracelet_cost.pdfIn PDF document text
    • http://volamejabevakik.22web.org/zubakalenakigi.pdfIn PDF document text
    • https://cdn.sqhk.co/xejoxoka/igPihsa/magic_fluids_hdr.pdfIn PDF document text
    • http://expo-kit.ru/23912103222e38if.pdfIn PDF document text
    • http://dabatimogumerek.iblogger.org/87039651867.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/how_to_make_him_love_you_more_through_text.pdfIn PDF document text
    • http://top-agent.ru/fixodasuxateximuvozivu1tbdu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwefotikejumu.rf.gd/amped_wireless_sr10000_setup_guide.pdfIn PDF document text
    • http://memilupa.rf.gd/7313591896.pdfIn PDF document text
    • http://fomupobidep.epizy.com/what_is_oatmeal_on_21_day_fix.pdfIn PDF document text
    • http://fepapemifen.epizy.com/susudi.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_off0000bf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF08 5612 bytes
SHA-256: 2bde98c7e59e5b86e1eaa367bdaed9ae73588fb3c3bb81218892d9ee5238e8f8
font_01_sfnt_off0000d23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23D 10308 bytes
SHA-256: 65938e5b44f6913c405b11884797c36bdb6ead8f86f6d359b3a6fa7a02aedefe

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