Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6c906032846ff4b…

MALICIOUS

PDF

78.7 KB Created: 2021-03-20 18:23:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7c302e238f5a3cb3e3e733cdec12790e SHA-1: 8946852d262cf8e207852e78f61a40f1488c16d7 SHA-256: c6c906032846ff4bc1c0d2ebdb84d9b18c92f08140493a8d9196aa26fc9a1ba7
126 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It contains a large number of external links, many of which point to disposable hosting, suggesting a link farm or SEO spam operation. One of the embedded URLs, 'https://nipisod.ru/123?utm_term=star+spangled+banner+trombone+solo+sheet+music', is particularly suspicious and likely leads to malicious content or phishing. No scripts were extracted, but the PDF structure itself is used to host and redirect to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=star+spangled+banner+trombone+solo+sheet+music PDF link annotation
    • https://tekoriforeta.weebly.com/uploads/1/3/4/6/134639422/dozofudolos.pdfIn PDF document text
    • https://zedowami.weebly.com/uploads/1/3/1/6/131637063/daborotajavisotodimu.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/zigum.pdfIn PDF document text
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/2128194.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/differential_calculus_bsc_1st_year.pdfIn PDF document text
    • https://wanesutilujat.weebly.com/uploads/1/3/4/8/134868149/wiwakabotaxe.pdfIn PDF document text
    • https://gawuwusirijer.weebly.com/uploads/1/3/4/1/134108670/mosogazuraf.pdfIn PDF document text
    • https://keregejuvuja.weebly.com/uploads/1/3/4/3/134345288/8466597.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/46262506541.pdfIn PDF document text
    • https://zozolexiwu.weebly.com/uploads/1/3/4/3/134343356/mufagogege-vapetu-zakisibemi.pdfIn PDF document text
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/faxujufi.pdfIn PDF document text
    • http://lazokiwumemo.mygamesonline.org/82352757010.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/42346270655.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/837e6817-70fb-49eb-bb84-8d88bd5964cb/toyota_yaris_2007_hatchback_tire_size.pdfIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_c18f585270ac4ed794d383a8ba0927ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/126c71eb-70e0-47a4-bc9d-e988a26429bc/meade_etx_80_autostar_manual.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_c5f5532d328f4a1d83e0f2f6442b0b75.pdf?index=trueIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_27abeb47380d4e9db616548649d86e66.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ce378d-f653-4391-9392-50c2f07def46/ruwobuvagafifusuvabesado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09a48f1b-2d26-4c7a-b2c0-90e8a375bc9e/90845329164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce472099-e2cf-46bb-a459-33690206ad42/janupurapiraduvalexiladak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f8cb34a-d411-4f69-a5c7-434859abb4a5/lubawotalufifufemov.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_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 5728 bytes
SHA-256: b03cf071daaf8f96bfb3fb187cb594364e713516df8fa703534bd0a179427120
font_01_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 11256 bytes
SHA-256: 6116e22a2e487ef456d72e6f4839123d49798e0b505182c1c6083d72a0cebe65