Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f029a6df087c2f…

MALICIOUS

PDF

87.0 KB Created: 2021-02-23 07:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 02fd2d3cef92929357adbcfdba2fa4f3 SHA-1: 1362a86d044a875eee35178ff058dd7c449fa59b SHA-256: d3f029a6df087c2f28248424fbf014801f5d75ca0d0ce1bc7c081be51e6d8611
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 links pointing to external PDF files hosted on various domains, many of which appear to be disposable or part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lead users to potentially harmful content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=vb.net+coding+pdf In PDF document text
    • https://fedonofawok.weebly.com/uploads/1/3/4/8/134881994/98a5545d30ba.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/chdjeaY/gokidesexidozap.pdfIn PDF document text
    • http://bufukaw.iblogger.org/wills_lifestyle_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_601ba5995b893.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/jcjfbhb/guvidineliferiz.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/UYhM1s4/is_unleash_the_archers_a_christian_band.pdfIn PDF document text
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/4601c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448337/normal_60005584b2ba6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485935/normal_60065d53b9d61.pdfIn PDF document text
    • https://zezogilak.weebly.com/uploads/1/3/0/8/130874046/figufopejodule.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/haigCAl/td_bank_usa_swift_code.pdfIn PDF document text
    • https://zejuraxarobepek.weebly.com/uploads/1/3/1/4/131407797/nepuxo_vezamex.pdfIn PDF document text
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/figexu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sedobuxekazadi.rf.gd/lagu_blank_space_cover_pop_punk.pdfIn PDF document text
    • http://wotonopeg.epizy.com/23482115610.pdfIn PDF document text
    • http://xozutafutigifa.rf.gd/munuvezuroperukiwoxe.pdfIn PDF document text
    • http://kitukogoxav.epizy.com/93302961664.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_off0001179f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179F 4944 bytes
SHA-256: f10464adf38802a7e58bb9b3d7a6436b915eeeffc7e389badaece00169a8c8dd
font_01_sfnt_off00012896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12896 11328 bytes
SHA-256: 7d8a3ae0020b0d2ab188a00cdecb1a6042ff514fb2682364f94036fdc9c90c53

Open this report in the interactive analyzer, or submit your own file for analysis.