Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e83fc104089dfbc…

MALICIOUS

PDF

79.1 KB Created: 2021-05-17 08:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b40ec4a7b03c394800123aab1576aa4d SHA-1: 3b469cf9a07befe46aa5108557c8c711cc08e53e SHA-256: 0e83fc104089dfbc5b672db5c91f6f0cebe66474e84d8ec79b56bc75cc295c01
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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=roland+tr-8+rhythm+performer+review PDF link annotation
    • https://cdn.sqhk.co/lisakopew/hcnjejh/funny_guys_are_dangerous_instagram.pdfIn PDF document text
    • https://babibuxa.weebly.com/uploads/1/3/5/3/135302477/relefaduso.pdfIn PDF document text
    • https://gelowoxolup.weebly.com/uploads/1/3/4/7/134703814/7238461.pdfIn PDF document text
    • http://fofakowusagafo.22web.org/bhu_bsc_ag_entrance_exam_syllabus.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/hcdgi1A/townsmen_6_premium_apk_mod.pdfIn PDF document text
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/bakefufinew-pekomowa-zezesewaxitijij.pdfIn PDF document text
    • https://cdn.sqhk.co/setuboluraje/15ggzig/35488060987.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/urdu_to_english_translation_full_sentence.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/f2iifjj/91383802466.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/iKAhhgh/xuzifegafapemototi.pdfIn PDF document text
    • http://nojigopagapusu.mygamesonline.org/pixelerolavofuz.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/jiVjjfX/best_pickup_truck_ford_raptor.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://bawexoji.rf.gd/99011368151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f191dc2a-32e5-48d5-a30e-ae03109b31b5/charlie_and_the_chocolate_factory_original_soundtrack_1971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe5ce1e4-0328-45c1-a146-f9603b8f68e1/fatir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74aead3d-9e90-4e1d-8be2-73bb7e32dffc/translation_and_reflection_worksheet_answers.pdfIn PDF document text
    • http://ketavulamuxi.epizy.com/2858444754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0452d48f-8850-4a24-9c40-9ffef4844e0a/what_does_an_employment_lawyer_cost.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE998 5376 bytes
SHA-256: cd93b9fd884aec4e653db09ac1ad2b46529310d70101e13ee870c1894486a2a7
font_01_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 10492 bytes
SHA-256: ec55e07ea7926ab11062be72da5badcf9f8f541ca07894a6a327bee3e194dbea
font_02_sfnt_off00011fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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