Malicious PDF — malware analysis report

Static analysis result for SHA-256 945785a3657dd77e…

MALICIOUS

PDF

68.2 KB Created: 2020-12-20 10:31:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 591b41980c7e280ae6ccb1ea9414c49c SHA-1: 94f8deff48c22c1bb928ba747bd28ba56815ba2f SHA-256: 945785a3657dd77edbb40cb7535aa7bc1d31b3e331d4453d23b2be3138a89a65
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The primary URL, https://traffine.ru/strik?utm_term=character+map+the+crucible+act+1, is likely part of this malicious infrastructure. No scripts were extracted, but the PDF structure itself is designed to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/strik?utm_term=character+map+the+crucible+act+1 PDF link annotation
    • https://demogevofowa.weebly.com/uploads/1/3/4/6/134608938/5145554.pdfIn PDF document text
    • https://ruwelijowabol.weebly.com/uploads/1/3/4/3/134307429/1bb4f65b864.pdfIn PDF document text
    • https://bonagimeduvutup.weebly.com/uploads/1/3/1/4/131453121/dupudipoturo-wudowegebux.pdfIn PDF document text
    • https://felupujefokedab.weebly.com/uploads/1/3/4/6/134621420/vijodijivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_5fbf00dd0ff4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460251/normal_5fbe1d223648b.pdfIn PDF document text
    • https://gebikatewizej.weebly.com/uploads/1/3/4/3/134311033/8949483.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://static1.squarespace.com/static/5fc13f7d5687f52b6b837984/t/5fcf643514319a51dc310aa8/1607427126572/joplin_tornado_death_photos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/392b9f93-514b-4523-afdb-7e6ab7433a24/xvid_codec_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/shading_algorithms_in_computer_graphics.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/simmba_aankh_marey_audio_song.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/y_griega_spanish.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc7a3b0a190b16b315946c/t/5fdd0a642641315525348084/1608321636998/92657106855.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F5 4876 bytes
SHA-256: f97f9e883e965473f7ec16a6766d63f5d4810656d5f02819e95ff5d92ae9b419
font_01_sfnt_off0000d48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 9868 bytes
SHA-256: 0baee077666e45617dfa4cc1af78f46ef03b86cba49e546a75f1f19914c07493
font_02_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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