Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da4d83b0df15a7b…

MALICIOUS

PDF

58.7 KB Created: 2020-12-19 04:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 2298f28d4b6158c86352204f438fd651 SHA-1: dc7df59ccfb5babb22d528c2fd6be19cba4ad100 SHA-256: 5da4d83b0df15a7b8525285646a40e108596131f8ba667fa6d58680f5d4da1b3
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, trafftec.ru, which is likely part of a phishing or credential harvesting attempt. The document body, though heavily obfuscated, suggests a lure related to 'Mastering biology photosynthesis answers'. No scripts were extracted, but the presence of an external URI strongly indicates an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=mastering+biology+photosynthesis+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464539/normal_5fc125991aea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416798/normal_5fd3c3d771fb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_5fd8ff4fac8b7.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/setaxilitozuko/bariatric_surgery_guidelines_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/99795698048.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/dotavuwokimozasum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29ff3ed8-aa40-4c49-ba7c-a4f8a33bd96d/dimensions_of_google_form_header.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/abc_ny_traffic_reporters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae517173-1979-4f37-9080-0b43c7c9e4f1/mekajolagejisiterosubifan.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/phantom_tollbooth.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/brahmachari_tamil_movie_video_song.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc708dbc2869f0c81c0ed97/t/5fd660615488895576ab4a5a/1607884898105/44091156266.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/four_year_plan_college_template.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_off0000abe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABE0 5420 bytes
SHA-256: 9f828bb40d4b7cdc6a5b7b58a93fa50e86948a09d21a0b1ef9e7a2bfbcdc0afa
font_01_sfnt_off0000be65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE65 8832 bytes
SHA-256: 7de299c4c9ee41cc143eaccaaf950b1ff90cf44fa1ac63703b7a0f525f7ce490

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