Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc833959a8d24ba…

MALICIOUS

PDF

82.4 KB Created: 2021-03-25 04:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5b2510e45e9d11b3decb856a266721ab SHA-1: 9a3f29a4f9e8f75e5b717c4ba2a83598e48d1e25 SHA-256: 6fc833959a8d24ba3f02b6f6798296d197289633d2caf7b05625e523103c5e93
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'common idioms and meaning pdf', which is a pretext to drive users to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://maypoin.ru/award?keyword=common+idioms+and+meaning+pdf PDF link annotation
    • https://cdn.sqhk.co/womibakok/XpEUggr/registro_brasfoot_2019_gratis_yahoo.pdfIn PDF document text
    • http://cheapestshop.xyz/administration_interview_questions_template2r09q.pdfIn PDF document text
    • http://vopugixeroramox.medianewsonline.com/the_brigade_pros_focus_during_the_military_decision-making_process_mdmp_is_on.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/70643324443.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/mC3hijc/tepawovini.pdfIn PDF document text
    • http://raffle.website/650914551613bjwf.pdfIn PDF document text
    • https://cdn.sqhk.co/togareguko/Ukohfji/cinemark_peru_promociones.pdfIn PDF document text
    • http://dekiweragaf.mywebcommunity.org/vufodaw.pdfIn PDF document text
    • http://gaxenop.medianewsonline.com/78199544599.pdfIn PDF document text
    • http://gtmedis.com/bosch_aquatak_100_plus_manual271a7.pdfIn PDF document text
    • http://trelon.fun/10566198813xqvo2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412763/normal_6035a488a7b10.pdfIn PDF document text
    • https://cdn.sqhk.co/waganozusi/EDe6geU/29053575187.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488804/normal_5fed4332e6f36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377391/normal_605615b81e16a.pdfIn PDF document text
    • http://storezone.info/how_to_change_battery_in_safety_1st_thermometer8wa8s.pdfIn PDF document text
    • http://sasegotib.medianewsonline.com/nawajerotapipopo.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/cyEzgd2/xinezidumak.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/zobir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_6040ddeb0e646.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
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_35daab00b085475497a7c3d795aac560.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_a4d557bb78cb4fa79fd8a45ffaa2a1a6.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_75bee0eadbbd45fc9d9c3e79f10f36f1.pdf?index=trueIn PDF document text
    • https://761e60ea-5e0e-4c43-b4c2-f6a9045c608d.filesusr.com/ugd/545033_f408dd4ed93a439e890accb485080731.pdf?index=trueIn PDF document text
    • http://bitines.myartsonline.com/41258240083.pdfIn PDF document text
    • http://judiserod.onlinewebshop.net/comptia_a_certification_all-in-one_for_dummies_4th_edition.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_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 4964 bytes
SHA-256: 8c5feb904a0a4a20599bbe635e9c35bb22e417c371e54d13b9fccf2d84658a04
font_01_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 10900 bytes
SHA-256: a5c26a18186207ce7ea25323efebb86ff479d2c6fe2a30d26ac7203ab008a4c5
font_02_sfnt_off00012e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333