Malicious PDF — malware analysis report

Static analysis result for SHA-256 091650385ab003f5…

MALICIOUS

PDF

75.5 KB Created: 2021-05-23 21:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f1336c8117c2cc59c949e9ce28abe985 SHA-1: e33c3eb13c29b8e522f5fa3303c23da40df2f140 SHA-256: 091650385ab003f52d94fe24accbe8f39d5e4c47e9c0ab0abb60fbb41f648223
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=carrier+weathermaker+infinity+troubleshooting PDF link annotation
    • https://kovirelumen.weebly.com/uploads/1/3/0/8/130873776/faeb0421.pdfIn PDF document text
    • https://jizufozerujit.weebly.com/uploads/1/3/4/3/134343201/pagop-wumokexinuba.pdfIn PDF document text
    • https://pemilixip.weebly.com/uploads/1/3/5/3/135330450/zebenekepan.pdfIn PDF document text
    • https://nawiveburejofi.weebly.com/uploads/1/3/1/3/131381882/gojofawe.pdfIn PDF document text
    • https://manabaxijex.weebly.com/uploads/1/3/4/6/134626004/pemifidew_bedivakulexabu_xowanewufem_bomepalixad.pdfIn PDF document text
    • https://divojalu.weebly.com/uploads/1/3/4/6/134664609/22bf10.pdfIn PDF document text
    • https://zememaxuzibur.weebly.com/uploads/1/3/5/3/135326459/6409961.pdfIn PDF document text
    • https://jikuwizavu.weebly.com/uploads/1/3/4/8/134873999/8398c1d.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/8bca8339-b2c6-4828-85a4-dfbb994b13cc/dimugexorokiluvedukopovam.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/spontaneous_bacterial_peritonitis_guidelines_nice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31870b70-7848-4ccd-8e2e-7904ac1a4b59/cuantos_galones_caben_en_un_metro_cuadrado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b20a107-6fb3-4161-824b-faee18190848/zidixagikeledemunale.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/70889414333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/439b4f33-82e4-4766-81e7-aebd1ec44ccf/zexenaz.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/jafejukopivanuxab.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/cbse_marksheet_2012.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/fmcg_area_sales_manager_jobs_in_bangalore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7931ef1f-a169-47c0-b1be-8b655c682a9a/84154876775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa613a56-70d6-4d68-8493-081de4e6e883/56771043821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81686603-7ed6-4f45-b1de-55f92ff061e8/peaceful_easy_feeling_solo_guitar_lesson_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b6ea2ca-3a11-4aaa-bbc7-e6f6d59ffd5d/kavomusipomebu.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_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 5484 bytes
SHA-256: 4a43b322f8b98fd697a42620c133ac81a5bb0eb2ba150d205319183c659c6454
font_01_sfnt_off0000fb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9E 10756 bytes
SHA-256: 74e44ab04d4953817eabce8bbc968d5aacebbd387de0db67ef898e803ae33e15