Malicious PDF — malware analysis report

Static analysis result for SHA-256 a160eb70070598d8…

MALICIOUS

PDF

82.6 KB Created: 2021-04-03 05:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cc7926dd32c583229bec378ec8e2b0e2 SHA-1: 883486b398f81466fd20b0b9a901e195a069d908 SHA-256: a160eb70070598d88496f15a70d5aeb9acda0ca3242099fd081241509795215c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/strik?utm_term=tr%25E1%25BA%25A7n+%25C4%2591%25E1%25BB%25A9c+th%25E1%25BA%25A3o+tuy%25E1%25BB%2583n+t%25E1%25BA%25ADp PDF link annotation
    • https://cdn.sqhk.co/fewukise/bicjajd/ifttt_alternatives_free.pdfIn PDF document text
    • http://zibepifutidi.sportsontheweb.net/sekuxizoparobazupu.pdfIn PDF document text
    • https://jokunotewe.weebly.com/uploads/1/3/5/3/135314966/femekejod.pdfIn PDF document text
    • https://cdn.sqhk.co/dizoketa/H6OFcji/best_slot_car_racers.pdfIn PDF document text
    • https://nutevozugunejeb.weebly.com/uploads/1/3/1/4/131483143/tediradeveperog_lefofudavox.pdfIn PDF document text
    • https://lupiwofuguneb.weebly.com/uploads/1/3/4/7/134715795/zopakixo-zelomeka-gunevuti.pdfIn PDF document text
    • https://sulipebi.weebly.com/uploads/1/3/0/7/130739254/suvimiverutege_lurat_liturumo_zofur.pdfIn PDF document text
    • https://betozuwozoz.weebly.com/uploads/1/3/4/1/134108580/gupuviz.pdfIn PDF document text
    • http://nawemofukewo.medianewsonline.com/wekiranejulojejogene.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/Thf5hey/cute_wallpapers_for_phones_with_quotes.pdfIn PDF document text
    • https://vofamebibefa.weebly.com/uploads/1/3/4/6/134694090/d188e9b7f.pdfIn PDF document text
    • https://cdn.sqhk.co/katafojedul/iicijgh/tap_titans_2_how_to_use_artifact_optimizer.pdfIn PDF document text
    • https://pevamuwewewi.weebly.com/uploads/1/3/4/6/134636281/b9c032cb128688.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/QJidOyJ/96236858104.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_2a30a1a94b5749c6b207006fdf6bda37.pdf?index=trueIn PDF document text
    • https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_d106a95557de4c0ca11b09ba6acda2e2.pdf?index=trueIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_5b1bfbc371e9420c8bb0cc1ad25fef88.pdf?index=trueIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_3fb50c47df3b4c25b7bbd2dc93b03ac9.pdf?index=trueIn PDF document text
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_821fc5811102484082cebb3ab6ed386c.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_aa01c662d94d4e459c48bf519dec4eb3.pdf?index=trueIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_203763ac307a44f6822a8d6b714c0782.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB18 5676 bytes
SHA-256: 03903a8b3c669969054eed26ee3898c932b7fb359075e1c4be8bb7f3a22ee2a8
font_01_sfnt_off0000fd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD16 22252 bytes
SHA-256: b16f4440b25578621601bed7a0974d0f5607536f1f1e2bba21cb4e507148753e
font_02_sfnt_off00012d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D03 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3