Malicious PDF — malware analysis report

Static analysis result for SHA-256 2166d7fe15cda9fb…

MALICIOUS

PDF

66.8 KB Created: 2021-03-25 17:36:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6a153814233e8e200c3ce9949bce4633 SHA-1: d2f1f96111d25c7d318846397fd9085fec580527 SHA-256: 2166d7fe15cda9fb121cf17ef6fa90b5d46ad5fa40127d0fa40957c87a01160b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to 'multiplication bingo printable pdf', likely to attract clicks and facilitate the distribution of further malware or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://gimoguvi.ru/award?keyword=multiplication+bingo+printable+pdf PDF link annotation
    • https://cdn.sqhk.co/desogepupema/ePatbic/knife_crash_apk_mod.pdfIn PDF document text
    • http://tikovg.xyz/29362936109bhmho.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/4ghhjjc/44058332970.pdfIn PDF document text
    • https://cdn.sqhk.co/sepexapubu/jdjaigG/72896842458.pdfIn PDF document text
    • https://cdn.sqhk.co/litigoruf/XjNhbji/pencil_sharpener_french_invention.pdfIn PDF document text
    • https://tebifenan.weebly.com/uploads/1/3/4/6/134675993/0ddb61ffbcbaf3d.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/hjridGJ/phoenix_suns_news_trade.pdfIn PDF document text
    • https://pakowojazawari.weebly.com/uploads/1/3/0/7/130775116/zijufobebafixowovuku.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/Jq9uxid/mmhg_by_full_form.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/ifhbSEp/small_business_loans_california.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/jeeBmTI/car_diagnostic_scanner_tool_bluetooth_obd2.pdfIn PDF document text
    • http://sdek-24.cc/wimpy_kid_characters0rv0o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_55b42e9facb04d39b57ed183fad64c91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87dd6306-0302-4f40-b5bb-c1b058c81ed6/90729778612.pdfIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_fb398a08470846bca981aede79059a67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a78d7e-90e6-41e1-b1f5-2ea0f06331b1/what_is_the_subject_matter_of_geography.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_off0000c8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E0 5288 bytes
SHA-256: 320c029d9e55aec3c6b2a0d9a5845867f990fa0e2929586461ea1bc69a35b1c1
font_01_sfnt_off0000daf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 9684 bytes
SHA-256: 3ee3fcc58543466752dc4072a70e1b72b0761b5ce66095016f7b54ddeb24904a

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