Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d8c029479a84f4…

MALICIOUS

PDF

76.0 KB Created: 2021-03-24 03:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b684893bc66098bc5364adcdc8199918 SHA-1: dc547bf9537b16ed36a0c0a2e87fc875d26d3ed6 SHA-256: 79d8c029479a84f4547f35bafa8b5a86cbfafcc5a8417bb75bc865eb4a4faa4c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It utilizes a link farm strategy with numerous external URIs hosted on disposable domains, aiming to obscure the ultimate destination. The document body, though heavily obfuscated, suggests a lure related to downloading a popular book, likely a pretext for delivering a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://botokaw.ru/wix?keyword=download+dan+brown+the+lost+symbol+pdf+indonesia PDF link annotation
    • https://gematisi.weebly.com/uploads/1/3/4/5/134599806/molododosewaraxoz.pdfIn PDF document text
    • http://suwefazimim.medianewsonline.com/visokoramibinoxuvadekerux.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/4073170776.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420617/normal_5ffc0f6a4f65e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453142/normal_60099e54f0ddc.pdfIn PDF document text
    • http://ogranicbio.fun/nilutenivuzimenasipabls654.pdfIn PDF document text
    • http://xteenware.online/lonely_boy_images_with_quotesmard0.pdfIn PDF document text
    • https://likemopulijufo.weebly.com/uploads/1/3/0/7/130739197/fakakavudosizix-wifutabal-diritiveziji.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/what_is_health_psychology_course.pdfIn PDF document text
    • http://hytri.com/learn_speaking_englishq3n5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_60337acf60420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5fe79fead957d.pdfIn PDF document text
    • http://nanamojuvimujo.medianewsonline.com/crypt_of_the_everflame_trove.pdfIn PDF document text
    • https://kerawidirara.weebly.com/uploads/1/3/4/7/134746453/8672464.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/zewuxon.pdfIn PDF document text
    • http://xagugudel.sportsontheweb.net/properties_of_geometric_distribution.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_a985fed93d8f47059ace4812f58a3332.pdf?index=trueIn PDF document text
    • http://tipokeviti.atwebpages.com/pabavoripuwejumimisi.pdfIn PDF document text
    • http://kabuzore.atwebpages.com/jagiw.pdfIn PDF document text
    • http://pogetowem.onlinewebshop.net/bestiary_6_link.pdfIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_417df8de99f44efca0fe5a4eb147390e.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_a2b7d5ed5a8d4084aa8d24c180fc6a6a.pdf?index=trueIn PDF document text
    • http://saluwagasa.onlinewebshop.net/bescherelle_anglais_pour_tous.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_8cdb36288d2d4a41b543b9945c029f04.pdf?index=trueIn 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_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 5616 bytes
SHA-256: 9ad7c2c0fa67ff2140b97f1dc71738e836a7fd52c2c895f80d27e993c5068231
font_01_sfnt_off0000fb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9A 10692 bytes
SHA-256: 8229b80a01c7dc979bd23d1519a1e36401632f66cffae439ea945e40834cb281

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