Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a863afb4772e71d…

MALICIOUS

PDF

69.0 KB Created: 2020-11-13 04:51:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d6bd45e2b46f97bc557d62e3a5400253 SHA-1: 92de5339188801953b37e356fe4d02406815d977 SHA-256: 8a863afb4772e71dc90f500e9c18fe5803503eaea25f091b36dfbcf17e5135b9
164 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 and presents a deceptive download button. 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafftec.ru/123?utm_term=spirk+fic+recs PDF link annotation
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/tiwazapiwef.pdfIn PDF document text
    • https://leruzifu.weebly.com/uploads/1/3/2/3/132302941/986818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_5fa7e7ffb9511.pdfIn PDF document text
    • https://jazakeramexevam.weebly.com/uploads/1/3/4/6/134615015/9281549.pdfIn PDF document text
    • https://kexoxuneve.weebly.com/uploads/1/3/4/5/134501441/jesamufitoxifom-zezawodebi-zulireloga-jepanelexoxu.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/b6bf17ee-223b-41a4-8553-4a085e620619/62946670877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0fb1f06-8d47-4fb5-bb42-c99797b81dea/dnd_5_artificer_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e06a84a-f735-4db0-93bc-c82af921f081/wafowajikogesid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce61435-6080-4b11-b278-7bf0742c3eb5/20227157919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14b35b3a-e7e9-470c-a3e9-5d524fc671c9/dawur.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/3d_pen_templates_christmas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cef1b43b-e98d-4b20-9ee4-464662041f58/72844081752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f170a96d-9942-4810-87d9-c41914087d18/wuxisawurijez.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_off0000d17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 4936 bytes
SHA-256: c39bb03b82ab0a94f947354d413c934319dc95b6948fea65f6873847540597b9
font_01_sfnt_off0000e264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE264 10876 bytes
SHA-256: f7309f2ada7d777734d05e4ca502996bf1e6353be248a4f13c441fd6164912d5

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