Malicious PDF — malware analysis report

Static analysis result for SHA-256 23cfeccffa92571c…

MALICIOUS

PDF

71.7 KB Created: 2021-03-06 05:41:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8fc1e9d241be29d0f620dc18f29b8fa1 SHA-1: 0b4ed91c790a2bfda365b888f9653693031594af SHA-256: 23cfeccffa92571c4a37472a5a96c05246e026712a9c7a52c754cb7bd9927fb9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect the user to a malicious site for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=libros+sobre+los+atributos+de+dios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450355/normal_6034933635686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418764/normal_601335ca59ce0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448332/normal_5ffcf2a74a5cb.pdfIn PDF document text
    • http://zumbayuliya.online/13534302015bhewf.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/geFBgiE/93822520869.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501028/normal_5ff34ddd7603c.pdfIn PDF document text
    • https://cdn.sqhk.co/tixuniwe/ejdFghU/46572375817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_5fd200ddafb96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_603e6f069fb0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379491/normal_5ff91983ad0dd.pdfIn PDF document text
    • http://test123test.xyz/starting_a_hedge_fund_with_your_own_moneyow3ss.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/bghRiho/windows_computer_launcher_for_android.pdfIn PDF document text
    • http://euroshopme.site/zuzanofudojenupizakuji4hzxl.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/YhgqhdD/pibolusofaxizepevisonif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365656/normal_6001d6b1dd96e.pdfIn PDF document text
    • http://kdghy.online/stick_wars_super_hero_fight_apkkkhx0.pdfIn PDF document text
    • http://cheapestshop.xyz/468914633196lr1b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc444a24-ec91-4c38-b9e8-d4bcb52ca226/ver_el_hobbit_2_pelicula_completa_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11410860-27c8-4fb9-a5c4-fc8b3a24adca/my_sony_sound_bar_subwoofer_not_working.pdfIn PDF document text
    • http://tawaxinazaka.rf.gd/zonalupepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e58ea0a-ed12-48c3-9f4b-55911d1b1ad3/holmes_mini_tower_air_purifier_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3da5cc35-0bb9-4b94-ac41-4f37406f4a4a/libro_eva_luna_de_isabel_allende.pdfIn PDF document text
    • http://dorediludopa.epizy.com/barish_ki_bunde_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a09d7df-4825-4d01-9403-3e4704511aac/my_frigidaire_affinity_washer_wont_drain.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_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 4900 bytes
SHA-256: c5452cfc7f21d393e57c6e45aab5555c8150fc44510019b0c75cc2edb2bad464
font_01_sfnt_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 11384 bytes
SHA-256: 2de3f119adf842de5cd46adeaba1e96f5dade04666f75c6c10c1a761fde3293d

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