Malicious PDF — malware analysis report

Static analysis result for SHA-256 873142874a23f070…

MALICIOUS

PDF

76.4 KB Created: 2021-02-24 05:44:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dffc553a0ed271c2f13dcd774daacea8 SHA-1: 9468f65f15f5343461396c01b56c15d5a2f6c93f SHA-256: 873142874a23f070c11fed5b130115df0cc95d470d6cf6eff626210dd0c8e509
186 Risk Score

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 0.9998

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://jacksth.ru/strik?utm_term=we+gonna+party+like+it%2527s+your+birthday+song+lyrics PDF link annotation
    • https://bumiwawewa.weebly.com/uploads/1/3/5/3/135343946/c438585b4ad.pdfIn PDF document text
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/3250215.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/Uhejcha/microsoft_news_feed_for_chrome.pdfIn PDF document text
    • https://rokawutavepuma.weebly.com/uploads/1/3/0/7/130776645/446437.pdfIn PDF document text
    • https://malolikekex.weebly.com/uploads/1/3/4/7/134718462/7567319be.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/ujejfgf/chat_usa_login.pdfIn PDF document text
    • https://korenumotijele.weebly.com/uploads/1/3/4/6/134687452/7ac0f407694b.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/loKniaP/3244291201.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/gukubejetegoteje.pdfIn PDF document text
    • http://vinnipoh.fun/android_cardview_background_color_gradientkq36i.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/8a34eda90ef.pdfIn PDF document text
    • https://musevupuli.weebly.com/uploads/1/3/1/4/131438528/xejuvotuxojen.pdfIn PDF document text
    • https://mexilaret.weebly.com/uploads/1/3/0/7/130775974/fufawiwewani_dimukig_zoxebupesobig.pdfIn PDF document text
    • https://fitovixuzo.weebly.com/uploads/1/3/1/3/131380078/1446272.pdfIn PDF document text
    • http://idealica-it.website/photoshop_cs6_extended_tutorial_for_beginnersc9459.pdfIn PDF document text
    • https://cdn.sqhk.co/wituruxa/ghfjfih/gatuxerulawefenefuxexerem.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://gazusoketa.epizy.com/how_many_calories_in_a_dominos_medium_margherita_pizza.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 5572 bytes
SHA-256: f56d7173237908134fdf37e1a7547fb20e3c926269a8ef80437db9c89b6ffab2
font_01_sfnt_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 10164 bytes
SHA-256: aa5c00bb6c00ff308500252a98e6e75b9d043d0b4d6b5b1ed4ee8e3a0dd4cda6
font_02_sfnt_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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