Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb389db5ba7cd517…

MALICIOUS

PDF

107.8 KB Created: 2021-01-02 08:24:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 61ac1315541c07a60d3ddaa120e4c2d3 SHA-1: 50a948a8ddd84b4e3b28438cc2cf75a972e9e240 SHA-256: fb389db5ba7cd51776a782be2025fb3dfcf90388f17c6a9ad532e1d0d58845fd
214 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ggtraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, one of which is 's3.amazonaws.com/rilexazejuzovep/plant_adaptations_worksheet.pdf'. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or trojanized PDF. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=algebra+1+an+integrated+approach+answers In PDF document text
    • https://jedogivezuse.weebly.com/uploads/1/3/4/8/134862252/nixalebetegevuwomuno.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/rilexazejuzovep/plant_adaptations_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e34591b5-0c14-4fd6-b02e-bc231c6ee75f/why_is_the_number_1729_special.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a419f3f-f8f5-47be-a596-604b709f58f0/coin_master_app_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe3344d-654f-49b9-9f2f-7c39d144dd79/tumhe_dekhe_meri_aankhen_mp3_song_fr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abd33e4b-eb65-482f-952c-9716d899a529/64944630032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc7f860a-d784-4e2e-836b-352d3b3bc109/16702061449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24052902-2e75-4b84-b41a-30fd7a21d0a7/polom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49193172-2871-4128-b792-6d9328aaa59c/14410126940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6711e461-18bc-4b52-9969-d8cc039ba07f/surugazekosodugezotomija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f170a96d-9942-4810-87d9-c41914087d18/wuxisawurijez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a11dcca-2fa3-466c-8a63-56f5e9fc5bc0/lefivujetowasoragatubun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cbdd127-61fa-411c-88c6-593350a42c76/8463991189.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_off00016944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16944 5608 bytes
SHA-256: 14bc093179db59dde7364484cfbd63419f67fad7bcc699f6dec17581f896953f
font_01_sfnt_off00017c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C5A 11112 bytes
SHA-256: ed1055f05f9a97f2430f8b1723599af8a170a71d2074aef954be17d6d956c82d

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