Malicious PDF — malware analysis report

Static analysis result for SHA-256 38cbf41e57aeb3ce…

MALICIOUS

PDF

81.3 KB Created: 2021-03-13 15:58:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 70f964652093e0f603b8031db4f76545 SHA-1: 571d536b50604fb6708116fce1e9df6d1debd104 SHA-256: 38cbf41e57aeb3ce7fbae1498b2cb7dd85ae417c71c749bf0c204dcd8df001f1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting and are likely part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The embedded URLs suggest an attempt to redirect users to malicious sites for further exploitation.

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://botokaw.ru/123?utm_term=astell%2526+kern+ak+jr+user+manual PDF link annotation
    • https://pusosisuko.weebly.com/uploads/1/3/6/0/136094517/luziwapidifa_letaxi_zavelux.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/zijidofevaluwotin.pdfIn PDF document text
    • https://julubagarod.weebly.com/uploads/1/3/2/6/132695517/lasasefidujanaf-wolezopen-barufisamupad.pdfIn PDF document text
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/pevuxubirepinoxej.pdfIn PDF document text
    • https://xexemisekugo.weebly.com/uploads/1/3/4/6/134679242/4f09e028d8.pdfIn PDF document text
    • https://cdn.sqhk.co/zexupibo/3ggJyPI/93882816179.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/Xjagjkl/star_wars_episode_1_cast_anakin.pdfIn PDF document text
    • https://cdn.sqhk.co/kapipota/hHF8ibl/remizivorivasarojonifoni.pdfIn PDF document text
    • https://ridawijobufori.weebly.com/uploads/1/3/5/3/135318292/e198160a755c893.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/16456032859.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/14860ebd-79ba-4e2c-ac67-64c70f508fe6/puroxofan.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_0a4783145114450db9de53edc508526d.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_0897689cddbd4bf68357d6b91a3856c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e699b37-183e-4976-a8dd-ead8e6b681b7/75595040742.pdfIn PDF document text
    • http://guxejusoselota.myartsonline.com/53462075424.pdfIn PDF document text
    • http://mumomovi.rf.gd/17882859216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9438ea01-b6ff-496f-a521-e424f52c076c/heat_glo_electric_fireplace_troubleshooting.pdfIn PDF document text
    • http://japinoxizidunub.myartsonline.com/what_is_popular_culture_google_scholar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94806c2-fe82-41d9-bd91-62ab246eaec9/gokolujogudu.pdfIn PDF document text
    • http://xakizeko.epizy.com/weber_spirit_2_burner_propane_grill.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_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 4356 bytes
SHA-256: 5ca71f46ee7854d2be6f3e622a3dc780a320c50e73f482eb7719eaf3d0c8a992
font_01_sfnt_off00010584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10584 16676 bytes
SHA-256: fbb02dfba6a47a87793c115c393010e8c4d2e9092ba33228ce4de0b8524e9b24

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