Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3795a0835094b56…

MALICIOUS

PDF

58.6 KB Created: 2020-11-04 21:12:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 19061a25ffc4af81b8b1b34575186237 SHA-1: d34ff4716f82f10e14ae3da99b69f8b054ab0801 SHA-256: d3795a0835094b56783ec456e5d87c8c4caad7f3e9a8d9b54248034fce8dd0e6
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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.
  • 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://cctraff.ru/strik?keyword=collegiate+dictionary+online In PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/pogupewevivakovoxu.pdfIn PDF document text
    • https://nodarato.weebly.com/uploads/1/3/4/4/134487471/344906.pdfIn PDF document text
    • https://sexutenevasasi.weebly.com/uploads/1/3/4/3/134306733/b393d22fb21ac8.pdfIn PDF document text
    • https://kilunifogewawo.weebly.com/uploads/1/3/4/4/134457757/kezifab_zobegafamizam.pdfIn PDF document text
    • https://puxipevabama.weebly.com/uploads/1/3/4/3/134308905/sumutimusowazowo.pdfIn PDF document text
    • https://rukinedofixod.weebly.com/uploads/1/3/4/3/134348838/legopapabigiji-koxize-polaputowabo.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://s3.amazonaws.com/rijaliwiguvex/vector_calculus_mathematics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce2bede4-42f4-4be8-9a5c-1cf107653bb4/rulawofawoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee2f3dc4-d9cc-401b-87e3-65f7b71db930/pezanorewemafigit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9381c95c-474f-456f-9349-5721089dda04/jisokopufu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1860b5bf-4b2c-4f5e-b454-7a190042dc95/kifuvutenakusom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e95656-40af-4725-8ca1-2a1e128616e2/26987180612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea813f3-7b4d-4b66-bd15-a05629484b62/38448472291.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a527.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA527 24176 bytes
SHA-256: 2d3d6a74de0c5ab002ac11241b9a9b8b2949eb126ee0ace9c9d4d83674fdd4a6
font_00_sfnt_off0000711e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x711E 4840 bytes
SHA-256: 85fe511402898a628bf6047009bedc3f03d4e99b0c9665a3c4c676c152670171
font_01_sfnt_off000081a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81A5 10300 bytes
SHA-256: bb599cb8df6478bb7f3f25b24d3c7b5d6230408ba1130310e2be34e8cf3170d2
font_03_sfnt_off0000cf4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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