Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efe9d97c054728f…

MALICIOUS

PDF

72.9 KB Created: 2021-03-08 12:55:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 96f2a747c8c33898cfed3f4ae72f9ab7 SHA-1: 275fefa0d49ed3250b37a01ac6aff1183afdef5f SHA-256: 8efe9d97c054728fc6463aa52a13e39df32816ae56480c5fc725ea532fc44b20
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting it is part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of link farms often involves redirecting users to malicious sites or phishing pages, and the presence of embedded URLs supports this. The primary purpose appears to be directing traffic to a network of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=present+perfect+simple+just+already+yet+pdf PDF link annotation
    • http://pihodze.com/kinesiologia_uba4oedi.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/hdhjgeQ/sokoz.pdfIn PDF document text
    • https://xatefokagakutil.weebly.com/uploads/1/3/4/1/134108848/3797307.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/waler.pdfIn PDF document text
    • https://minunelojob.weebly.com/uploads/1/3/1/4/131453060/sivodiponef.pdfIn PDF document text
    • https://pumejikugo.weebly.com/uploads/1/3/0/9/130969330/ditufok.pdfIn PDF document text
    • http://juwoniki.getenjoyment.net/senini.pdfIn PDF document text
    • https://vepiniripalur.weebly.com/uploads/1/3/4/2/134235349/6014826.pdfIn PDF document text
    • http://rejamar.sportsontheweb.net/cuanto_es_1_32_en_mm.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/acer_laptop_price_in_bd_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/delinilipo/UbNj0zF/applock_fingerprint_lock_android.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/gfn7hgs/jirizewolisu.pdfIn PDF document text
    • http://vbruti.site/125883147257co1o.pdfIn PDF document text
    • https://cdn.sqhk.co/wugeguxu/ihjeAij/billie_eilish_hop_tiles_beatles.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwutiro/ijCibha/bivatipibesoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/sibamoxa/jjApGTj/jebupinake.pdfIn PDF document text
    • https://fodewifejala.weebly.com/uploads/1/3/4/4/134491976/3218408.pdfIn PDF document text
    • http://lutafem.getenjoyment.net/black_boy_story_book_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/eko66fv/xorajevubeperirofu.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/ibgigsh/jiffy_lube_oil_change_time.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujobope.atwebpages.com/nikon_p510_price_philippines.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_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 5480 bytes
SHA-256: 910365879e24546b21e5d7172bb56027a13766d47626dc281a573c92a92c4a8a
font_01_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 10112 bytes
SHA-256: 95ba22a9cdcb06078144b1adb2cd90a88320a4d201686bd3e03904f24cee1ac3

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