Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab56c880b543ac6…

MALICIOUS

PDF

74.1 KB Created: 2021-04-03 20:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7594c1033c3f0a2c1dd692873589304 SHA-1: add80fcb68b0e522573f815b052bef3028dc6dce SHA-256: 7ab56c880b543ac619ed7b64bbb0c107e8b20d7c713a5417f73dadb2158a6c7d
126 Risk Score

Malware Insights

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

This PDF file functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The document's content is presented as a search result for "how can i check transmission fluid levels", a common lure for SEO spam or phishing campaigns. The ML classifier strongly indicated maliciousness, and the presence of many external links 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://xezojetit.ru/strik?utm_term=how+can+i+check+transmission+fluid+levels
    • http://zexaribamemavi.sportsontheweb.net/degoripewinuziguf.pdf
    • http://mizizufiku.mywebcommunity.org/85135892584.pdf
    • https://cdn.sqhk.co/gabazumad/zRhhYj9/red_lens_sunglasses_amazon.pdf
    • https://cdn.sqhk.co/vidoperife/id0wncT/93190329958.pdf
    • https://cdn.sqhk.co/velizovatim/ghL43kW/guborepulopobupitepogosob.pdf
    • https://zojovotonoturur.weebly.com/uploads/1/3/5/3/135348007/ripoteve_zukajajid.pdf
    • https://xaliwituxezaxe.weebly.com/uploads/1/3/5/3/135323019/donutujow-kesoporenapo-vawujij-koretuw.pdf
    • http://xijipeva.mypressonline.com/acquiring_new_lands.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cee4c475-053c-4dec-97e8-987d41263e46.filesusr.com/ugd/8c25c6_96ea131c568045039cd87ff9557d7dfe.pdf?index=true
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_93b2986490f84ca7ae0722833d78e8b9.pdf?index=true
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_d0458e798ef84e5fa7ba90cd67f0acdb.pdf?index=true
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_d454d692df8948e5a16c3880edb7705c.pdf?index=true
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_cd4f3579a8b0464dac358438b75fdafb.pdf?index=true
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_1029ccaf13fa4a43bfbcc2145bbfd668.pdf?index=true
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_406c45eb3f8749cd894f3df25227ae24.pdf?index=true
    • http://bepolujogox.atwebpages.com/burrell_and_morgan_1979_book.pdf
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_0d59db72fd344cc4af79e45ae887e64d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e52f.bin
49d8ab15a1046b01f104f92399cb4a6db3750b8d7f32704298a3872027aeb307		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 5440 bytes
font_01_sfnt_off0000f79a.bin
852927f528a8d476883528cbfc13354d053b24d2d4db8a28bb3c6284c2751437		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 10368 bytes

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