Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b8677187855f56…

MALICIOUS

PDF

74.0 KB Created: 2021-05-11 20:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d80db313b8e4f5300a30be8c5b88ca48 SHA-1: 220831064eea8368dc7ad28208053780539ddd2f SHA-256: 45b8677187855f560c2b999048626e2a42dcec0aef84ce6d23ea279390180194
126 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm. The primary purpose appears to be directing users to numerous websites, potentially for SEO manipulation or to host malicious payloads. The ML classifier strongly indicated maliciousness, and the presence of many external URIs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=por+que+es+importante+la+contabilidad+de+costos PDF link annotation
    • https://gufakapefevem.weebly.com/uploads/1/3/5/9/135994046/ligozid_savasajuwu_wajakibasigoje_rokamov.pdfIn PDF document text
    • http://afracheat9.xyz/xanepewasatugoved25ism.pdfIn PDF document text
    • https://loxogekero.weebly.com/uploads/1/3/4/0/134040689/4633706.pdfIn PDF document text
    • https://fofodivadi.weebly.com/uploads/1/3/4/8/134895081/vizuwomonu.pdfIn PDF document text
    • http://dombitarf.ru/apeman_a77_manuale_italianopgno3.pdfIn PDF document text
    • http://4d-5d.com/renugafenutatirabowajevu39ejq.pdfIn PDF document text
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/3131777.pdfIn PDF document text
    • https://dopapebo.weebly.com/uploads/1/3/4/8/134870178/1535736.pdfIn PDF document text
    • https://fimetopim.weebly.com/uploads/1/3/4/3/134399480/afe57ce30.pdfIn PDF document text
    • https://zeruwowigewal.weebly.com/uploads/1/3/0/8/130813736/8977399.pdfIn PDF document text
    • https://tibefuwejar.weebly.com/uploads/1/3/4/3/134332688/b33bc4bb.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/widuxade/katemodepavoduwuvibem.pdfIn PDF document text
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_a7a714518ca14866a11ac8ad92995221.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/885006084.pdfIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_bdea26a78c1c4d2688bf6952677ec369.pdf?index=trueIn PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_b584f7e1c58045fcb82ee5db90106d4f.pdf?index=trueIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_be58a4ee52684856b1419ea15709c0d1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/penale/curso_de_ingles_intermedio_gratis.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_b747ffb7d2d1454391c4ed4e91704031.pdf?index=trueIn 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_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 5488 bytes
SHA-256: 7b07411c84ee833096ce239c50b10ef3857c9f9c8e78ded5bf1c595fd75d77cd
font_01_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 11660 bytes
SHA-256: d9ec1421efb8fe5f535253850e51ab27fb3396513c2aa93a113856f334cd0ccd

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