Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1de359dc84b123…

MALICIOUS

PDF

67.6 KB Created: 2021-04-07 07:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 531f0faa2255d5f926cab820c74c4ce2 SHA-1: c2154e211fdcb6c5d27ffe152c0e9f493cb4a0a2 SHA-256: 8f1de359dc84b1237d7550bdc950ed58864362091f0b47991355d1c06a94e0ad
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain associated with a link farm. The document body, though heavily obfuscated, suggests a lure related to 'systems engineering'. The presence of external URIs and the link farm heuristic strongly suggest this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=is+systems+engineering+worth+it PDF link annotation
    • http://pisazujinatef.iblogger.org/nilebudurojofejaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444114/normal_602f43ac24645.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384634/normal_603c3ff187f36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470985/normal_606973ca85024.pdfIn PDF document text
    • http://naturfresh.space/428482017173fnf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_6036f451efaa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_6052435c414bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480743/normal_5fe43bb699b35.pdfIn PDF document text
    • http://topcabinets.xyz/positive_affirmations_for_anxietyr94kj.pdfIn PDF document text
    • http://zibodotuf.mygamesonline.org/59518858531.pdfIn PDF document text
    • http://prognoz-football.club/dejedalomoxugegoropu7wp90.pdfIn PDF document text
    • http://norelowugazilu.22web.org/86113859169.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380084/normal_5fcc7e427a5fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwedilejom.myartsonline.com/42706743718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19b1e428-b3a5-4274-a250-b30a82fbbae2/8151391620.pdfIn PDF document text
    • http://sebokegekesuded.atwebpages.com/apoplejia_hipofisaria.pdfIn PDF document text
    • http://jiguluvosasibun.epizy.com/lavapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6988e957-6800-4e19-86d0-9af23ab12b28/38898300683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7555b4f0-1934-4452-9dcf-89c937f91b8c/master_airbrush_e91_assembly.pdfIn PDF document text
    • http://dajidagetulawu.epizy.com/nametigikoxumuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be920ec-8e04-4b97-8802-1e2d5e91a62c/xixuwumef.pdfIn PDF document text
    • http://jelomasulavi.atwebpages.com/ignition_timing_advance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c48110-30b2-4133-af05-d88456003554/what_is_pre_op_for_knee_surgery.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_off0000ccca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCA 4988 bytes
SHA-256: 80f95bdd18b6389aa8ea71625448682a4e19b2cb3b881f51aebccc0606c13abb
font_01_sfnt_off0000ddaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAF 10284 bytes
SHA-256: c2ecb9564fa4598a3f6ec7795add74419f589361d0c13fbb5c53ebf6dd8f3a8f

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