Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64b171cfff57266…

MALICIOUS

PDF

88.9 KB Created: 2020-12-22 14:30:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3c0ca2ffc6a92fcc7a213ae74f23041d SHA-1: 91c416737ac73ce150e47f3cf9d53d81172ee3c0 SHA-256: d64b171cfff572660d4be1ef0f41bae31ed21650a19d2f32c021e4249dc2e746
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. ClamAV detection and ML classification strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URLs likely serve as part of a phishing or scam campaign, aiming to redirect users to harmful content.

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://traffking.ru/strik?utm_term=retroarch+citra+core+not+loading PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381730/normal_5fbd04db47a8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_5f9a0321a7897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f8863db8a4ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_5f98a1ce598f4.pdfIn PDF document text
    • https://nobokoxevukaj.weebly.com/uploads/1/3/4/7/134755509/surazukiwoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412762/normal_5fbcb9e5a2a32.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/kugelilizibuwum/large_format_film_cameras_ebay_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/776ab88b-32fa-4442-a4b5-f9d6b5bbd413/extreme_weather_worksheet_ks2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3219cf-ec9f-45f9-85f1-5f44d1130e23/vba_link_1.7.3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f8a83a4-fd13-4a9d-a18a-aa7c7722bc57/69255789769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f14cfbdb-8415-4e84-97ff-0b68b7bd956f/endgame_full_movie_putlockers_free_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c75de6dd-c6fb-4bac-97a6-e9709490a12b/gugekefeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/798fa4b0-036b-4c9d-9cd8-07cc1d821336/14703550487.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/wogipelaxo.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_off00011923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 5028 bytes
SHA-256: eb6f0836928b4cd0841e7a8c84f6d5eab0f38ee6ea1e52e1a67b3c714d31be55
font_01_sfnt_off00012a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A34 14204 bytes
SHA-256: 7d9e9175bcb8d44f68cc81bd5fae7ba66d0a2c3a13ce54a10e3571b7519e353f

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