Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9efc1adba61618d…

MALICIOUS

PDF

73.2 KB Created: 2020-11-21 06:54:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f1767c093258969af05b7b6f2877366b SHA-1: db2d8791c06ee73b75fbe05f5acecff8a6f63f4a SHA-256: f9efc1adba61618d3cd411904caf1f18147b3ee3bd859da19dcca8e007df40d5
194 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 7

  • 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.
  • 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://trafffi.ru/aws?utm_term=b.+e.+d+online+form+2019 PDF link annotation
    • https://ligotilup.weebly.com/uploads/1/3/4/3/134313371/6685886.pdfIn PDF document text
    • https://puvemeximaz.weebly.com/uploads/1/3/4/4/134442093/kojimozixux-fefodix-rupik-puvujiti.pdfIn PDF document text
    • https://vowodilob.weebly.com/uploads/1/3/4/6/134697463/6b1b29c.pdfIn PDF document text
    • https://gofexuzadefedim.weebly.com/uploads/1/3/4/3/134306088/nekawigozogi_wurob_tovaripezadaji.pdfIn PDF document text
    • https://xorozatu.weebly.com/uploads/1/3/4/4/134461248/lodunika-vatewex-jolewemuxa.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/b910e6ccdc5b58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5f9f92bd1758d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_5faef01febbfa.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/ade273d2-30b0-41e5-9d54-7bb6738ea153/28292286029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88dca041-9ba0-4c14-bbe5-538a4111a674/manchester_united_bleep_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/673649d2-b110-4763-b650-39326980cc75/swimming_sectionals_2020_indiana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c26d29-2853-468b-83dd-a59908bce5db/4777108853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/781e7af1-4d3c-4ee6-b00a-88a1688d5056/84836698608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a24752a-33cc-46f4-a29d-602a50d1d2d7/32152554479.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_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 5228 bytes
SHA-256: bdcf8b638c056f7adb9a0520a0ba4786ee7b1d12565312ceed0b7cd22c67f8af
font_01_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 10856 bytes
SHA-256: e5990a13e0b57021308b8aad95208fd45716b14e90cf4887be6b71fe3af700de

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