Malicious PDF — malware analysis report

Static analysis result for SHA-256 5459dc11432f60c2…

MALICIOUS

PDF

52.1 KB Created: 2020-11-07 06:32:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 15eeaf77d89fe6d96bc3ac3903d7af76 SHA-1: dd7828e8d3fe7871a59d46e2eea2e3c1ee9b9187 SHA-256: 5459dc11432f60c2002e5e81ced9cc708c6a3ac7e5067b8ea5079e0b6b14e188
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious or unwanted content, likely as part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://trafftec.ru/aws?keyword=planet+earth+jungles+worksheet PDF link annotation
    • https://zuforupixonop.weebly.com/uploads/1/3/4/3/134394080/602a3f7d7.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/9724312.pdfIn PDF document text
    • https://sivirezu.weebly.com/uploads/1/3/4/4/134445297/928275c336.pdfIn PDF document text
    • https://duxobibalarig.weebly.com/uploads/1/3/4/3/134360367/mamodojum-pumeki-susorobomur-gawoxev.pdfIn PDF document text
    • https://febukorev.weebly.com/uploads/1/3/4/3/134325382/5ea293fe1.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/gogowitijunamila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416153/normal_5fa0a00d2186c.pdfIn PDF document text
    • https://tolafapod.weebly.com/uploads/1/3/4/4/134486806/vepaju_bibowelilulub_dedofazuli_wogov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389384/normal_5f9f236681844.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/b145d70a-0fa0-4cd4-a1fd-5053c22263e8/togisejoxajivepidevoxuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0aa3d7b-9390-4611-9339-4cf95f74263e/national_hispanic_institute_great_debate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08e7013e-af91-4022-9ae4-f215980d5029/tajoziribigemudux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/058f312d-b83a-411c-ba63-79897955f865/suzevitedefisodiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f12aade1-aa91-4ed3-a5e6-f5189ab8a9cd/minecraft_earth_map_1._14._4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ff2c65-9e92-4ad4-8eaf-968b7480b677/dugavikujafo.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_off00007642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7642 5180 bytes
SHA-256: 37222ff24e72a9d672360fe4422d6eb13af3da28143fe1ad22702a68da0627e3
font_01_sfnt_off000087f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87F3 11196 bytes
SHA-256: 04005834777a024bd92faf56f1dec49b1d44d616950f68ad8b290d9a5bde6ecf
font_02_sfnt_off0000ae3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3A 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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