Malicious PDF — malware analysis report

Static analysis result for SHA-256 28310c34921e2489…

MALICIOUS

PDF

68.6 KB Created: 2020-12-19 10:32:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e46250b54b7331b9e8b14595f9ee03d3 SHA-1: 966f32fa39b2b64a84e1dd7fa72d488338308e38 SHA-256: 28310c34921e248941c75fe3db212eac9da088f1600ff54a58a92f8c634a0861
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The embedded content, though obfuscated, likely serves to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffi.ru/strik?utm_term=what+is+a+cherry+bomb PDF link annotation
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/mewenerewurexa.pdfIn PDF document text
    • https://natufebopod.weebly.com/uploads/1/3/4/3/134305275/bisejalojemidaxajigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450509/normal_5fa78178ddb38.pdfIn PDF document text
    • https://dapevorejux.weebly.com/uploads/1/3/4/6/134695165/pazezifulura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485926/normal_5fd113d5c9bb4.pdfIn PDF document text
    • https://sepikupi.weebly.com/uploads/1/3/0/7/130738949/raxetajig.pdfIn PDF document text
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/moxuwofuwonoven.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/dd7fc90e-4a55-4598-994c-7116b78e1780/dumonis.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4dea13398ff7515474161/t/5fcc668dd336b863f0b9bd72/1607231120014/29886166403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/429c5363-b58c-41d0-bf34-4876cf63cd90/3796499302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb87a9d2-11fe-4eea-81b8-7c87a632e889/dezuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fba9bb18-5b59-4168-bc52-5aaeb8e21d4c/the_road_to_learn_react_by_robin_wieruch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f22f0ca5-be3f-4dca-b6a7-15cca6c260e8/funny_memes_clean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0df74a87-1798-4b44-8921-fda7e59b27ee/24718305496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62eafa10-2137-4914-94d6-d8c5f9e6557a/descargar_pokemon_oro_heart_gold_espaol_drastic.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 5264 bytes
SHA-256: e619de19561f86d0e548595a48f4ea4a5825d5c47e580e83752563802dd80859
font_01_sfnt_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 11200 bytes
SHA-256: 9834e4189d1c14e53f4b1f124ab2f85b98206766455748fb2d4769e67566d1a3

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