Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3d4554f4f62415…

MALICIOUS

PDF

65.7 KB Created: 2021-03-14 15:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ed6143ec117af379911ef4064463709 SHA-1: 766c53e3c846079860de5e6403d246acb8f01180 SHA-256: 1f3d4554f4f624158ce678722b43c3ce30c717b27400a536a2c7bb38c22d89e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or phishing attempt. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/strik?utm_term=don+juan+mexican+ann+arbor+menu
    • http://litvinenko.xyz/40348279898msy7j.pdf
    • http://topcreditscore.info/litanswer._org_not_workingk8xre.pdf
    • https://cdn-cms.f-static.net/uploads/4378853/normal_6010d5324b2f8.pdf
    • http://reliables.ru/bkash_agent_app_linkyb8u1.pdf
    • https://static.s123-cdn-static.com/uploads/4369916/normal_5fee7d3b06fd5.pdf
    • https://static.s123-cdn-static.com/uploads/4448116/normal_5fcbee1e149c4.pdf
    • https://cdn-cms.f-static.net/uploads/4445130/normal_6027e22dd335b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sorogamat/65353769313.pdf
    • https://s3.amazonaws.com/radubozufiwo/astronomy_olympiad_books.pdf
    • https://s3.amazonaws.com/sonutopexaramuf/popunanerudamedodaxed.pdf
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_343f08b2b0784f2bbbb8d43952ea395a.pdf?index=true
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_d4596fbc90ef41e9923090406e20b54f.pdf?index=true
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_d67af98472d343fd9f15e02bc783eaca.pdf?index=true
    • https://s3.amazonaws.com/fedufiporara/sejegu.pdf
    • https://s3.amazonaws.com/xoferuzu/avast_antivirus_mobile_pro_apk.pdf
    • https://s3.amazonaws.com/tanikanaw/fl_commando_hacked_game.pdf
    • https://s3.amazonaws.com/gezetega/28606813721.pdf
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_a1976b24581c4831a9f5233e91857a18.pdf?index=true
    • https://s3.amazonaws.com/rejiner/28864656033.pdf
    • https://s3.amazonaws.com/xonobijikivo/13982825007.pdf
    • https://s3.amazonaws.com/fuwenoxuzasila/115734813.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c62e.bin
bd0fbb7f19d7de905119b1d801e109e8a10bdb314a6ea3ce6ab33e616fa8f822		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC62E 5016 bytes
font_01_sfnt_off0000d735.bin
6765e55b0e35982ead31c06c8e33706f264f9eef9629bcaedf6b15380c464bfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 10296 bytes

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