Malicious PDF — malware analysis report

Static analysis result for SHA-256 846999f29f6ffe74…

MALICIOUS

PDF

79.4 KB Created: 2021-03-29 12:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c7aa8bcccbb4407987ee352447368e42 SHA-1: b064645f590551cf35aba95ed7773d455651c2d7 SHA-256: 846999f29f6ffe74d14168b2e7a3241bc2f0a5a7a3a4ee0c6b5cb554ad9b82c2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://soxebez.ru/award?keyword=beyond+the+aquila+rift+short+story+pdf PDF link annotation
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/nabilosusami-wifixeburebomuz.pdfIn PDF document text
    • https://xilarurizajefa.weebly.com/uploads/1/3/5/3/135347329/kijafomunad_bogijonuf_wupifokeroduw.pdfIn PDF document text
    • http://lawexape.mygamesonline.org/29363025048.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/26637737268.pdfIn PDF document text
    • http://vasizazesunof.medianewsonline.com/kalender_september_2020.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/alimak_raise_climber.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwedilejom.myartsonline.com/what_are_the_features_of_organisational_culture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae4c500-47b4-4a1e-b0f5-b88e8045dc90/viwubobanifiniluxiji.pdfIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_5b0686f47e1c4bb8873ac7656f6fb2fb.pdf?index=trueIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_76ec5cc7d9384d6ca472a8b3bf88584d.pdf?index=trueIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_2566684963964c85a7ed9e10afc66493.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2efa4708-c69e-445d-bc58-67a1fe5a3bb2/lanugatojezixexovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19521d00-696e-4f12-8228-82d66c1e6838/65888927329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89d57fc3-e0be-4c21-aee9-0554ac019af3/dujigaruwedel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54731288-f5a5-4be0-89a2-5ab6dad1e403/16244679816.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_730bd1ebd3e64dfe9ff6265dc96dad1c.pdf?index=trueIn 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_off0000f941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF941 5408 bytes
SHA-256: 768033baf30a11398dc06a69cfb2f07b2ff3365acbd35c4e15707398438cecf4
font_01_sfnt_off00010ba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA9 10840 bytes
SHA-256: 6a94a66795d2b7ff8f461e491911d30e75940d0c7e5b496ecbc1fef688a3d9c1

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