Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bf32f7b4e20117…

MALICIOUS

PDF

84.7 KB Created: 2021-03-18 13:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ce5732e4ae3fa7410985e9aa5f794838 SHA-1: 3b65659989e48a3bb468b6aa3fa823b39c90a50d SHA-256: 73bf32f7b4e20117b21e17e935ebd0f73d1f9da4cd00c76549bcefac9951b6d5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/aws?utm_term=gluten+free+snacks+for+toddlers PDF link annotation
    • http://sunufosabupes.scienceontheweb.net/series_and_parallel_circuits_basics_worksheet_answers.pdfIn PDF document text
    • http://wenukitabozuv.22web.org/quran_english_and_arabic.pdfIn PDF document text
    • http://gesoxusem.iblogger.org/live_sports_firestick_apk_2019.pdfIn PDF document text
    • http://ramedefinu.getenjoyment.net/28830895131.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/bewomoremodonibutu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_a46773715e384f56bb432e3b8cdca8b8.pdf?index=trueIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_f6803663a5de493787f36c783c753951.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8776fab-2cd0-4f4b-8016-cfdadfab2e0f/32465595443.pdfIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_d4c938c826004f70a7448ad7a69f8e9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/wusoxenudeberizo.pdfIn PDF document text
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_380b4df0ad2643d6846f1a86cf9ac3e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debiwelof/ecology_journal_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/grapplers_guide_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ae2f28-9284-402e-9f7b-a74ab6957315/kiridume.pdfIn PDF document text
    • http://wawavubuwile.rf.gd/yellow_journalism_worksheet.pdfIn PDF document text
    • http://merovuditipin.onlinewebshop.net/jamejuxudu.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/69476015026.pdfIn PDF document text
    • http://fatavetotujel.onlinewebshop.net/lg_hbs_750_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/add_2e_monster_database.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_off00010fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FED 5112 bytes
SHA-256: 67b0fd5d9ffb750f54c38f28f369c4730fe89e93a2bc208949092c29e7bfa8ef
font_01_sfnt_off00012165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12165 10648 bytes
SHA-256: f2525ef87253d37cb32bb4578ec83ac2fb8c7b046ac4acacfd9ffeefb330e8c1

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