Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b7e6b5fdc8271f…

MALICIOUS

PDF

106.0 KB Created: 2021-01-07 20:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 96c454e62f49f2320158bd41c69b511b SHA-1: eae10359cbba16460b0556f904ed2ec442009a28 SHA-256: 85b7e6b5fdc8271f3d776e64cfa6b546bbd76dc4b3af8bb15bc1b0e78b7e3df9
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'trafftec.ru', which is likely used to host a malicious payload or redirect to a phishing site. No scripts were extracted, but the PDF structure itself is indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/aws?utm_term=amyloid-+beta+isoforms+antibody PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370762/normal_5fb53aa0f2c4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_5f9e8dfb2bcb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380078/normal_5fe213fba7b1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420030/normal_5ff59c1d20d7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/safago/52352566812.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/20809667904.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/calendar_templates_2018_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/20666934996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5794e825-5623-4a8c-8d01-48b18bf134f7/descargar_smashing_rush_parkour_action_run_game.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/xen_drik_dnd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ea7d18-78d5-4def-8d89-441798fe0cbe/les_couleurs_liturgiques_et_leur_sig.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/bootstrap_template_admin_panel_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/674203ed-7d80-4af3-9178-95e1c49fe799/ridgid_6_gallon_shop_vac_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b215c99-a855-4990-85c5-d8dc3b370f88/julut.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_off000151c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C3 5104 bytes
SHA-256: e97c5e780e2036a208fb7c62404355d40dfa4fe8a2e6ca10370c8b6dab3e823c
font_01_sfnt_off0001630a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1630A 12604 bytes
SHA-256: 52ff3eaf4fb4eeae83a73ec26dc819fdb03db45f35f493672bcf96ff4786459b
font_02_sfnt_off00018ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CE4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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