Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c164bbf79d8c9d…

MALICIOUS

PDF

76.6 KB Created: 2021-03-15 14:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f308cba3ce296fb15b6d7d1642300cdf SHA-1: 9dc084670102255a8cb93a85306c81347e8b4daa SHA-256: 50c164bbf79d8c9d817e5f485ff71320d3ffe23d5a8884a45f3df33bd88016ab
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/strik?utm_term=how+to+describe+sunshine PDF link annotation
    • https://senekidus.weebly.com/uploads/1/3/2/7/132740533/sedawa.pdfIn PDF document text
    • https://topejaliwas.weebly.com/uploads/1/3/4/3/134305960/b1dfba781e144b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374848/normal_5feb418591289.pdfIn PDF document text
    • https://renixopofofof.weebly.com/uploads/1/3/4/4/134486295/pojofaxudigem_dilinetawolep_debawedim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464863/normal_5ff16db3394a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_60175ca75f57e.pdfIn PDF document text
    • https://xijeruwenuvu.weebly.com/uploads/1/3/4/0/134018409/rijil.pdfIn PDF document text
    • https://pepedojimu.weebly.com/uploads/1/3/1/0/131069997/6b13d525dd34a.pdfIn PDF document text
    • https://zexajupa.weebly.com/uploads/1/3/4/6/134692079/tiwadiwogujalipu.pdfIn PDF document text
    • https://kunoloxudiruk.weebly.com/uploads/1/3/4/7/134767428/nanifokisejijol.pdfIn PDF document text
    • http://viwimewi.22web.org/77494323302.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447431/normal_60032ce29ca49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462708/normal_604a8b2515b5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505159/normal_5fc7323e2e41d.pdfIn PDF document text
    • https://nezasofesaz.weebly.com/uploads/1/3/5/9/135961661/1026776.pdfIn PDF document text
    • http://palorobumuwew.iblogger.org/94120443978.pdfIn PDF document text
    • http://munupesifak.22web.org/47459202437.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fatapiwav.rf.gd/hearts_of_iron_iv_achievements_guide.pdfIn PDF document text
    • http://salesog.epizy.com/smoothie_recipes_healthy.pdfIn PDF document text
    • http://beroseji.epizy.com/panasonic_tc-p42c2_price.pdfIn PDF document text
    • http://nilikejavovop.rf.gd/uc_browser_java_versi_9._5.pdfIn PDF document text
    • http://jasopiwutuv.epizy.com/windows_xp_install_keyboard_shortcuts.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_off0000efed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 4976 bytes
SHA-256: c011e46facd6b00a07211b3a6e3ed4cf00f33e36d6aa875e73cd7951447f9135
font_01_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 10444 bytes
SHA-256: 90c26976003b725ccf2e01b34ebfb103a602216f7f2ff0a7d532de3f63eca7a8

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