Malicious PDF — malware analysis report

Static analysis result for SHA-256 5653679817eb08b4…

MALICIOUS

PDF

70.9 KB Created: 2021-03-04 02:20:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 16cc20736dffec1afe22ba77d2ee64b4 SHA-1: faf3bfc932448383c82f62ffcbf49c53b74f0f60 SHA-256: 5653679817eb08b4c9dc5c75d03e0efada2ef16fa2f7f5d302de7334ca2e6d99
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable hosting services and some to known malicious redirectors. Heuristics indicate this is a link farm, likely intended to manipulate search engine rankings or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/123?utm_term=mcsa+study+guide+reddit In PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/1476609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373782/normal_5fd5f4610e1fd.pdfIn PDF document text
    • https://gixovazaviv.weebly.com/uploads/1/3/5/9/135982549/3941028.pdfIn PDF document text
    • https://nirusiji.weebly.com/uploads/1/3/1/4/131407521/fifadika.pdfIn PDF document text
    • http://fupemagis.mywebcommunity.org/sufabopipesow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499633/normal_5fd7cee8e56bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383452/normal_60045b22d0414.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/my_lg_washer_makes_a_loud_noise_when_spinning.pdfIn PDF document text
    • https://kewakovek.weebly.com/uploads/1/3/4/4/134467638/3189912.pdfIn PDF document text
    • https://xovobinawulum.weebly.com/uploads/1/3/4/8/134883327/87a42ca995.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/genedonapubefe/3798786050.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/76886878462.pdfIn PDF document text
    • http://xemigososefof.atwebpages.com/giviwawutixamosupebogovi.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_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 5180 bytes
SHA-256: 1bc19baf4e40ee5e684561980bcd72e52456fec342a2d10fd163dbe13739a308
font_01_sfnt_off0000ecfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 10112 bytes
SHA-256: 4332c0b1237d29b25e478f34ad9bf8892a741311c9bd948a937be99106bd1fe3

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