Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2de49e9beee78c9…

MALICIOUS

PDF

78.2 KB Created: 2021-02-25 08:00:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7c061a1c23ced814337e18601bd4905e SHA-1: 623928fdc3573564d44a76e05b0e1c97d0a3127d SHA-256: e2de49e9beee78c9718e6fa4ff6eb62be53fa0b0ff2a4a6be5509cfa06f1918d
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, suggesting it's a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, appears to be related to English exercises, likely a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/123?utm_term=english+exercises-past+simple+tense+regular+and+irregular+verbs In PDF document text
    • https://cdn.sqhk.co/xalibolopov/cjdFgc0/download_world_of_steel_tank_force_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453891/normal_6013d9e9181ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_602060faae94b.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/nphb1jg/natitoselorowep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422368/normal_6024c360beb66.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/72878559407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_602f70a0b74f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_603584dde9806.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/ap18ii1/wedafitavofejavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484812/normal_602025efb8d18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484820/normal_600bbe5b78f75.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/50hc3hc/sim_empire_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/juzogimuju/iiejggf/como_recargar_tarjetas_ais_para_cuba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/keloni.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/53281977298.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/dadedidujokuzereposuno.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/brown_vs_board_of_education_effects_on_special_education.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 5744 bytes
SHA-256: 577602c466edc6711d790d2923d78a1295eced9b8a7bd363bc6d0cbfdaa79dbe
font_01_sfnt_off0000f2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BA 10256 bytes
SHA-256: 7284577ff5a3e54710fab2a61b17a0fb22dc8425368cfb94606625fbcd8135d8
font_02_sfnt_off0001160c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160C 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2

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