Malicious PDF — malware analysis report

Static analysis result for SHA-256 006c47924b900303…

MALICIOUS

PDF

69.7 KB Created: 2021-03-29 23:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45b1aef5fbf54d8f58ba012abcee19eb SHA-1: 7831c372c91fcf9b8dfbd00809d1c5dfa237b467 SHA-256: 006c47924b9003032df53ed2d699874b4c33ab1d1d47262306156c6c3b87b787
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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/123?utm_term=macintosh+draw+sheet
    • https://wemizufatevovig.weebly.com/uploads/1/3/4/8/134896488/a62cb8f0a5.pdf
    • http://nitapida.mywebcommunity.org/31756004215.pdf
    • https://xuzumuja.weebly.com/uploads/1/3/1/6/131636792/jodatad.pdf
    • https://cdn.sqhk.co/kinanunir/iiUie5D/answer_how_are_you_in_russian.pdf
    • http://wolifote.getenjoyment.net/nurukaximotavu.pdf
    • https://rifezapolufopit.weebly.com/uploads/1/3/5/3/135316727/cfe3b5c0ce90.pdf
    • https://sevafigetof.weebly.com/uploads/1/3/4/9/134902911/321abda274.pdf
    • http://kidupat.getenjoyment.net/sijajokewemijunekuposab.pdf
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/8592230.pdf
    • https://cdn.sqhk.co/gavezexu/hhpigja/pako_2_best_cars.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tutasujal/36124560035.pdf
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_110b0aa6be7c45f6b9ee03c99d9b1c43.pdf?index=true
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_acb8ca4845ba42adae9f7f9388a14163.pdf?index=true
    • http://suwuwigo.rf.gd/grammar_proofreading_worksheets.pdf
    • http://tametawoga.rf.gd/cambridge_primary_science_3_worksheets.pdf
    • https://s3.amazonaws.com/woxotopapozokev/wesosijaxorujapuvijasino.pdf
    • https://4ce79df4-3863-4105-bd28-eb838a3c09ee.filesusr.com/ugd/1d3654_57308279f3f64bcca58a3682ee3aad92.pdf?index=true
    • https://s3.amazonaws.com/xanunafojuloki/8088039095.pdf
    • https://s3.amazonaws.com/kafises/76649635546.pdf
    • 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_off0000d33d.bin
0f8c5a468d96cb98c75ba2db2fb7021f0c700f6cd6803c207009940fad390a81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD33D 5092 bytes
font_01_sfnt_off0000e49d.bin
1e3bc4bc4f0ab38c1f51322d7fa829a2d8ce94bc078f2dcef91fd51d5640ec24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 10892 bytes

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