Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8578c1fda9dc972…

MALICIOUS

PDF

74.2 KB Created: 2021-03-21 21:32:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5932ea9dc9dbbcc8071588085ccc8f62 SHA-1: 2280615754931162a784eb9db8805e9229303391 SHA-256: d8578c1fda9dc97232e5639918013eaa7cef0d8f77ae141dc00f6ee510a9348a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to distribute malware or phish for credentials. The document body, though heavily obfuscated, appears to be a lure related to book downloads, aligning with the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/wix?keyword=monster+walter+dean+myers+pdf+download PDF link annotation
    • http://zozitaze.mypressonline.com/ley_80_puerto_rico_vacaciones.pdfIn PDF document text
    • http://jawazapefaxuzit.mywebcommunity.org/4398559511.pdfIn PDF document text
    • https://sujebufapu.weebly.com/uploads/1/3/1/3/131379792/tebuxezepekur.pdfIn PDF document text
    • http://clubstore.pro/teoria_del_conflicto_realistaa6aog.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/essentials_of_entrepreneurship_and_small_business_management_norman_m_scarborough.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/how_to_eat_right_book.pdfIn PDF document text
    • https://nixujukasal.weebly.com/uploads/1/3/1/6/131636737/4855902fbeb.pdfIn PDF document text
    • http://lightstart.xyz/buy_john_deere_ride_on_mower_australiaykkxm.pdfIn PDF document text
    • http://parrrtner.xyz/dubixipepasenifii79fu.pdfIn PDF document text
    • https://vosovijuz.weebly.com/uploads/1/3/0/8/130813614/bibawoxawuketo_katikadufolomuw_jojuromorexuk_zoruzuvope.pdfIn PDF document text
    • http://xaredazisom.mywebcommunity.org/29515280023.pdfIn PDF document text
    • https://kavivapepegag.weebly.com/uploads/1/3/4/2/134235540/jazofokeles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zumoxevozasumek.epizy.com/tabla_distribucin_normal_selectividad_andalucia.pdfIn PDF document text
    • http://ranovisodada.epizy.com/53913593574.pdfIn PDF document text
    • http://sujekafejawojav.rf.gd/baybayin_brush_font.pdfIn PDF document text
    • http://nibizuladode.onlinewebshop.net/patoviv.pdfIn PDF document text
    • https://67b15a64-aa4f-42ae-9bc5-9bcae931b20e.filesusr.com/ugd/f84671_decd8fe290644cfb87249dad9a56b826.pdf?index=trueIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_644c4b06293641bb888b2a64865f4646.pdf?index=trueIn PDF document text
    • http://najekaweza.onlinewebshop.net/89948991332.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_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 5388 bytes
SHA-256: 2b5bf8bb5d08981384471d9db039097b10a94735d3d7c067db491adc145b551d
font_01_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 11056 bytes
SHA-256: 7cca072b420b1cd31e4ae92396ec23c1acbea1414c7dd5d0ff3acd240d254ed4

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