Malicious PDF — malware analysis report

Static analysis result for SHA-256 7108172ef48100cb…

MALICIOUS

PDF

83.7 KB Created: 2021-03-09 01:11:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 6d732a5516334d2616fd752d11f04240 SHA-1: bd09fbf533d8090631b9d5bdc8b8e970bab8935f SHA-256: 7108172ef48100cb22c754bc2c54fb58e7000e8ab6a14c569675c22bc1db1e87
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The primary malicious URL identified is https://botokaw.ru/award?keyword=k+means+clustering+in+r+pdf, which is likely used to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://botokaw.ru/award?keyword=k+means+clustering+in+r+pdf PDF link annotation
    • https://polavimiwusirew.weebly.com/uploads/1/3/2/6/132681763/dabubugepi_fibosuzeninix_lavid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425491/normal_600672bae21ce.pdfIn PDF document text
    • http://nekemepomisares.22web.org/mordhau_poleaxe_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497666/normal_5ff03676cbf61.pdfIn PDF document text
    • https://binimejo.weebly.com/uploads/1/3/4/6/134665204/9485546.pdfIn PDF document text
    • https://zuzuxaze.weebly.com/uploads/1/3/4/0/134040629/7646278.pdfIn PDF document text
    • http://gajozemexip.22web.org/78578901619.pdfIn PDF document text
    • https://batusuxejodasav.weebly.com/uploads/1/3/1/8/131857782/8371468344495.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/degasibef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475729/normal_5fe3a4e0375a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382961/normal_5ff765801333d.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/47e52ffb-d247-4325-b7d5-f0dbb744335f/41847269895.pdfIn PDF document text
    • http://famebod.epizy.com/xevabuximejusarurowusuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41c4bf03-4149-4eb7-8851-86e27a1241d7/malixalitikogagufanadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7c434e-9d98-41dd-a1ef-bf9674012de9/what_is_the_word_envisioning_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65cff443-be47-4aa1-b1f1-4ed2e741edd4/12845720722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b901179-fda9-43e0-a126-88e312243f8b/ms_word_vba_find_next.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98657a7d-6d31-4355-847b-c6d4b759ebee/diwukapokugusujadagat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e5aaf5c-fe02-49f6-bf7c-1709f67da7cd/5123259495.pdfIn PDF document text
    • http://gokobuvutojo.epizy.com/decoupage_music_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14adb114-9544-47d5-a4d9-2011e36c7675/monsterverse_future_movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80a2be5d-8a77-461a-80bd-1834de228145/revuvufelasufug.pdfIn PDF document text
    • http://tizavoju.rf.gd/what_lancets_go_with_accu_chek_aviva_meter.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_off00010b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B50 5444 bytes
SHA-256: 3260f8efb23051e21c20b9cf68f37fd43cdeffead166e5e81c17fd325dc69c1a
font_01_sfnt_off00011dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 10348 bytes
SHA-256: bd873790f9409c3cb6ffc81ae6a84b819fe893637c7001cf76db0473f0460ecf