Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d21ddc6b9c2e9b3…

MALICIOUS

PDF

95.0 KB Created: 2020-12-02 11:50:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1272799246f5bf83150d4e2b398c3795 SHA-1: 94b5b4905100bf537a4fea8d4920d3976ef03427 SHA-256: 2d21ddc6b9c2e9b3480fc3fc93355d2dbf541e06983a4570de9a7e7b52bfc536
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with one prominent URL pointing to 'traffine.ru'. The document body, though heavily obfuscated, contains text suggesting it is related to 'Aaai 2020 accepted papers', likely a lure. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffine.ru/strik?utm_term=aaai+2020+accepted+papers PDF link annotation
    • https://durabaseduxoj.weebly.com/uploads/1/3/4/2/134235759/menulepetip-subezurowar-fonub.pdfIn PDF document text
    • https://wadozivapo.weebly.com/uploads/1/3/4/5/134512268/bibovinu-dakuvufitavivu.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/raduwo.pdfIn PDF document text
    • https://lunipudazu.weebly.com/uploads/1/3/4/4/134462877/korokokevakuf-xefesako-norabumemew.pdfIn PDF document text
    • https://buxexuwuf.weebly.com/uploads/1/3/4/6/134660927/pogesikoda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/vezadiduvuwogo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b1bb998-0c25-4707-906f-faf03bb2dd17/las_medias_rojas_analisis_literario_abriendo_puertas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d09ec3-ad8c-4c1f-84f0-802977d23f09/98084361444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b7dec45-0664-422f-a0c0-1be0b4aeef55/koxibezaninifulig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c97bac0-482b-450f-953b-85b8b0b32649/88239881036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a44c41-a57a-42df-9774-55935c013eb9/53330018006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/985f1f67-612d-40a6-92cf-dfd01c95f5b0/95251768792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bf475c8-06bc-423a-8882-cc319e4e844d/ligodepepew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8dbe301-ce17-412a-9056-2caf7499355e/tukuvupisitew.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/dbz_courtesy_call_video.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013c51.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13C51 27900 bytes
SHA-256: 7cbce5d3b31956f6bb56fdfed57de42916bf07def9611bee4f7262e05ff614cc
font_00_sfnt_off00010498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 5300 bytes
SHA-256: 08f0677ca968aa291edabe8e776b1f31dc90f9f91350f08a1afeff375f08cca3
font_01_sfnt_off000116ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 10992 bytes
SHA-256: 8d1212a15255f11bda734676fbed1dda25776387ce019575acaddb71f0539ece

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