Malicious PDF — malware analysis report

Static analysis result for SHA-256 5814839d7923a713…

MALICIOUS

PDF

67.7 KB Created: 2021-03-16 04:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6a9220245a85743a56572b261e63edab SHA-1: c50b24306d2b2bb76bef872b046462f1a50e349f SHA-256: 5814839d7923a7132c1b41df7d110d960380fb00252ee7a6ac43ba631180a75d
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam operation. The primary URL observed is https://leonvi.ru/aws?utm_term=how+many+carbs+are+in+a+large+ocean+water+from+sonic, which redirects to a link farm. The document body is heavily obfuscated and appears to contain junk data rather than user-facing content.

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://leonvi.ru/aws?utm_term=how+many+carbs+are+in+a+large+ocean+water+from+sonic PDF link annotation
    • https://jitebogegamoma.weebly.com/uploads/1/3/4/7/134761197/79dbb2957ea4a3.pdfIn PDF document text
    • https://nododekevage.weebly.com/uploads/1/3/4/7/134733794/xasez.pdfIn PDF document text
    • https://cdn.sqhk.co/salozudat/jbgdIHb/duxamolurelomujove.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/gie1gcQ/rum_balls_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/Qp4wicH/human_lifespan_in_america.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_604cc7eca2d93.pdfIn PDF document text
    • http://rakakap.iblogger.org/jimmerson_lake_fishing_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444366/normal_6023d5377277c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454665/normal_5fee2f86db0ae.pdfIn PDF document text
    • https://vimexizud.weebly.com/uploads/1/3/4/7/134755563/pokudotenatininu.pdfIn PDF document text
    • http://baxosemot.iblogger.org/94522272557.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456687/normal_5ffdcb31afcab.pdfIn PDF document text
    • https://lewibodozibepa.weebly.com/uploads/1/3/3/9/133997785/zadepegezogo.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/dhgQjgR/68249467396.pdfIn PDF document text
    • http://solerizimifo.iblogger.org/autocad_2020_complete_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pugagewuda.rf.gd/vilareloxa.pdfIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_afd9e1cb886441918278dfdd2af3accd.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_f5e4dc1e391d4aac8b37f519b0dcb4ba.pdf?index=trueIn PDF document text
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_57f993ef87cb43b8b9550aed755f3453.pdf?index=trueIn PDF document text
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_4ff0e035ad864001bacb72d6e4f664bc.pdf?index=trueIn PDF document text
    • http://jovukanuwu.rf.gd/xigirujufamuti.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_off0000caff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFF 5496 bytes
SHA-256: 9475791afef4dcd8515700e29ee6cd5fce02ec55c5c0e98061b21479dac4aea0
font_01_sfnt_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 10368 bytes
SHA-256: edb176439eb46ea7d6b574f1dab5be7e88f85d0ec4c72834f6e669a5a4550a75