Malicious PDF — malware analysis report

Static analysis result for SHA-256 3511aa2729ada979…

MALICIOUS

PDF

67.0 KB Created: 2020-11-23 07:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ee2a1b0d974322d13c3d06a2d748b5fa SHA-1: 767f43df6e4d54819bce0f5053019debdfe7077d SHA-256: 3511aa2729ada9793ea252b0b64bf3ec4b3987c3e8cdde068eb7250e973bf27b
136 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic indicating it's an SEO redirector used for phishing, linking to the URL https://trafffi.ru/aws?utm_term=color+fastness+test+report. The ML classifier and ClamAV also flagged this PDF as malicious, supporting a phishing or malware distribution attack pattern. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffi.ru/aws?utm_term=color+fastness+test+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392667/normal_5fb5c158156fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418575/normal_5fa5d922a12e2.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/da9afbc5-8e92-4a3c-a168-8535cf10116e/jepumak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43963772-84c7-4287-be56-b70d0065ac75/dreamcast_emulator_psp.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/chemical_quantities_worksheet_chapter_6.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/nursing_diagnosis_for_hepatic_encephalopathy.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/electrician_tools_name_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e353005b-4295-4083-bfc4-f88cbdd206e6/10129157395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af2fd8ef-5102-44dd-bd86-1544f5d3155b/vevadaxogowene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a50c9ad5-5ffa-4052-bbf1-55834fba837c/zusigejimavoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e36d29fd-8d39-4195-8d39-b2c1271d7212/the_great_acoustic_guitar_chord_songbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e20b5d64-a41a-4338-8a7a-80441e0f10fa/keihin_carburetor_manual_download.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_off0000caab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAB 4800 bytes
SHA-256: 28d26e90a3eb7869e33f32aa15e37c3a41632b705ffd8042764b157165fa699e
font_01_sfnt_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 10752 bytes
SHA-256: 52e3d89a4bdea18bceed33c45dbe5d1f1eb92a28539b2d1b8078a68d3f2091f6