Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42708c05489a23f…

MALICIOUS

PDF

40.3 KB Created: 2020-11-06 18:32:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d7f630911c90c61f56c6f76906aaadb5 SHA-1: 4d64298e21f3c020f9308dfa4480ecc84413b3c4 SHA-256: a42708c05489a23ff9e6ad45ff12456350d885480700b7ccd4f30c22e4df0f92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to direct users to potentially harmful content or for SEO manipulation. While no scripts were extracted, the extensive use of external URLs points towards a distribution or redirection mechanism.

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://traffnew.ru/123?keyword=the+arduino+inventor+s+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402014/normal_5f9ff2637422a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_5f9076edf395d.pdfIn PDF document text
    • https://movulejovem.weebly.com/uploads/1/3/4/4/134470355/42a8fcb39bd69e4.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jolon_koxuzozudanik_makilitinami.pdfIn PDF document text
    • https://defelidiko.weebly.com/uploads/1/3/1/0/131070982/3257441.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/waribif.pdfIn PDF document text
    • https://dedodewoluxo.weebly.com/uploads/1/3/4/4/134402612/3685873.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/7139115.pdfIn PDF document text
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/kozasoj-gapuro-zuwidaru.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jasamejug-jenutuzudemeluf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f8c98dc1114a.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/movav.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/rotafasaniz/96562833469.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_off00005eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFF 5064 bytes
SHA-256: d81a965e219c9065db228bc9f3359b700903f01c8e7467cacdfa446cdb0ca069
font_01_sfnt_off00007036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7036 10660 bytes
SHA-256: 9f89dc49ae15e009f77c640167734451c255e4fe90f753c9df853d9cfb764656

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