Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf842b35764857ff…

MALICIOUS

PDF

78.0 KB Created: 2021-03-25 14:53:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6cf6ad3bc705466bb4d8f1399c345dbe SHA-1: 0b36e5c6451c564dc37ecb0757c1ccb86d5d651b SHA-256: cf842b35764857ff61549c326b90d8a43915b167a7e231b4b2ab3fbb4ab31f67
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule, indicating it's part of a link farm designed to distribute malware. The ML classifier and ClamAV also identified it as malicious. The embedded URLs, particularly http://ita-bio.fun/ccna_notes_with_practical_downloadj6mby.pdf, are likely serving the malicious payload, disguised under seemingly legitimate filenames.

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://zajinet.ru/123?utm_term=counting+stars+onerepublic+piano+sheet+music PDF link annotation
    • http://ita-bio.fun/ccna_notes_with_practical_downloadj6mby.pdfIn PDF document text
    • http://iclod.tech/javascript_map_vs_for_loop_performanceog210.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408712/normal_5ffdef5872e4d.pdfIn PDF document text
    • https://befewegumezozem.weebly.com/uploads/1/3/1/4/131453636/9938775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_60105e4119df3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_600e5f7e51112.pdfIn PDF document text
    • https://mikuloxituxawe.weebly.com/uploads/1/3/1/4/131410747/fapofikusa_vupiguliv_vojopuzi_togekawaxeda.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/1a1e9be4-ad52-4266-9c52-5b62af633b44/what_are_the_4_sundays_in_advent_called.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d1fc0a3-015a-4428-978d-fce4fcca9deb/filumapapuroxet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82c5cb67-7206-4520-9a0a-abe6dbc1a68d/how_to_clean_hp_officejet_pro_8600.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ebb8668-7313-45fe-a282-d33644990e40/batman_kills_joker_arkham_knight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fdb6ad0-5ded-43e4-9629-60f8d93717bc/kisalegujusarotudarur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b10de014-8e32-4a68-b681-13adc2b88f3d/lg_waveforce_washer_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/258c3d45-8061-4ba0-b38a-79b47e598a13/how_to_fix_irrigation_system_leak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478444f7-750a-4ee0-97d3-9c5d4aa5ecb3/15908917717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39f3458d-b0c0-4975-b353-8dff40b80ffd/gotadaruzusozanivofasuba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8805e725-e3c3-4076-a1f0-54d83a1b890c/84128647809.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 5392 bytes
SHA-256: 459b52b7125285264edca34b6888e65e38b8ffdcf2e9e160870d73d33036ce93
font_01_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 1992 bytes
SHA-256: 845e2af297ca216abdd6ddbc6969826713b198ef297c4c7e812a04e98a1fad12
font_02_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 11516 bytes
SHA-256: cf326d51e384df87762a5083853cb33666fa4c51881f692878f2795a7f78cba8

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