Malicious PDF — malware analysis report

Static analysis result for SHA-256 4331f76e24f94782…

MALICIOUS

PDF

72.5 KB Created: 2021-03-18 20:21:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2cf375b82dc4e71f59cf745120004256 SHA-1: d9f0a139156ae243107a0cec84bfbc6549657389 SHA-256: 4331f76e24f94782832e3667b7798f567b2d84a90408eada5910f68cdbf1c33b
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 0.9996

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://soxebez.ru/wix?keyword=fuentes+fourth+edition+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/nosamese/wjhC8ic/xibuwetuvesid.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/fieibgg/5147543061.pdfIn PDF document text
    • https://cdn.sqhk.co/nudadubuju/uicmjjN/pubg_tournament_app_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/ribuwikoli/hgc8Ugc/3771644631.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxomawelej/8jcgixh/bambukat_all_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/kezavefizi/LgfmjdG/binuner.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/NX9hggd/21392062834.pdfIn PDF document text
    • https://cdn.sqhk.co/ninuxoti/ihjbgih/kaximudapemoda.pdfIn PDF document text
    • http://vavesojijakoju.iblogger.org/44764607931.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_cce04a2c9dad446e9f4aeffe744c015f.pdf?index=trueIn PDF document text
    • http://femodizabofowu.epizy.com/nizeju.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/bumigilumawuberederifobef.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/neurasthenia_adalah.pdfIn PDF document text
    • http://besidoxaz.rf.gd/paruxegi.pdfIn PDF document text
    • http://vutagefen.epizy.com/kukiwopisipub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74bc0d51-3bc3-489e-9d5c-62a3e2299ad9/dehumidifier_not_collecting_water_uk.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_b7a1b4ec32f541c59e12163b25da8fb3.pdf?index=trueIn PDF document text
    • https://b8f7bc2e-5f90-466c-a76c-b8215bfdb3ae.filesusr.com/ugd/9717d9_cc6268d4e15b4b9e8cf505c1cc2fc560.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbcade85-6d46-4e27-9d90-fe88ec7077e6/rusibud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76158932-322a-4724-a8ef-dd51d6588268/xfinity_set_top_box_says_boot.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_f94337bfbc56493b98765562dd833c69.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_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 5144 bytes
SHA-256: 6b1950618132fd08cad9fe461eeb1a470282886ef6dc731c4b6d8bb538f9f1d1
font_01_sfnt_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 12320 bytes
SHA-256: c4e6744a8692e02e91ba3b3e4892cb416c2a10e0931a803e4ada960104d6dce0

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