Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb5dd0f8b238ca9…

MALICIOUS

PDF

88.7 KB Created: 2020-12-30 09:02:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5ab463078eb56082f8206d69ecc18f69 SHA-1: 1e9f860a901a4389a075ea663f60ea49b547d465 SHA-256: fbb5dd0f8b238ca981eeb3ee0850e3999440f9a422115e192e2f6794cdf9c36f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with a critical heuristic firing for a PDF link farm, suggesting an attempt to direct users to potentially harmful websites. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=la+nueva+era+religion PDF link annotation
    • https://cdn.sqhk.co/sukurorezib/Pgc26MW/video_promoter_app_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_5f91e711123db.pdfIn PDF document text
    • https://cdn.sqhk.co/kakumipoman/ggEjbIb/survivalcraft_2_free_download_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f8bea3b24bbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473035/normal_5fb2f25f3da10.pdfIn PDF document text
    • https://pivamaxisogen.weebly.com/uploads/1/3/4/4/134481881/2524962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402936/normal_5f99e3629b0b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420587/normal_5fa1d089a8d2c.pdfIn PDF document text
    • https://gileledera.weebly.com/uploads/1/3/0/8/130874536/fujuzotufugeni_xogitovof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_5fbd961761365.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/ghd0IBn/73673527637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463551/normal_5fade3b0429a7.pdfIn PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/9ef2955150d2774.pdfIn PDF document text
    • https://petirinupupa.weebly.com/uploads/1/3/1/4/131438611/nipozi.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/35cb1e9a-7353-4838-ac0a-9e3f7e3748c8/84736156129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc4004f9-d450-4718-826c-f7bee5e028c1/37702098481.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_off00011f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F10 4676 bytes
SHA-256: e0082841b7cf34c722fa8448fdde0e092db1517ff8fc91927c6efe59ec1074cc
font_01_sfnt_off00012f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F10 11448 bytes
SHA-256: a73dd37376f9039a0250b78c30bc1905ebde7b976540f5793ee890cd52ac20e0

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