Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9b461036f5b119…

MALICIOUS

PDF

72.4 KB Created: 2021-06-02 20:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a407fac37ce6c723792da9ac23c4aaa4 SHA-1: 7af547133641709d2a143d6230d1ce59352eae00 SHA-256: 8f9b461036f5b1195e468c1e0f29320fd773f96d4f7211dd537d25cc3ba9117b
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'allytemp.ru', which is likely the primary lure. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, consistent with a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/pbw?utm_term=jeopardy+theme+song+sheet+music+alto+sax
    • https://cdn-cms.f-static.net/uploads/4383804/normal_6034366ce2310.pdf
    • https://static.s123-cdn-static.com/uploads/4500679/normal_5fcc0c558ee6c.pdf
    • https://static.s123-cdn-static.com/uploads/4452392/normal_5fee1b0515d2e.pdf
    • https://static.s123-cdn-static.com/uploads/4388160/normal_60000c3ce2aeb.pdf
    • https://cdn-cms.f-static.net/uploads/4417808/normal_6045ef00a79ec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/94c875d6-2962-49d1-810c-25fd414c2366/movie_maker_windows_10_italiano_download.pdf
    • https://uploads.strikinglycdn.com/files/f5e09ac4-6c59-48fa-948e-481b83adc367/child_labour_short_story_in_english.pdf
    • http://zepadatoju.pbworks.com/f/lutuxoferuwofosovekujized.pdf
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144424272/generic_usb_game_controller_driver_windows_10.pdf
    • http://gabumur.pbworks.com/w/file/fetch/144507378/novipubodetifinulav.pdf
    • http://tebejeloxid.pbworks.com/f/junuluz.pdf
    • http://wuvebag.pbworks.com/f/mejevisugaw.pdf
    • https://uploads.strikinglycdn.com/files/c92c2b43-5ac2-4be6-b33e-061bc4d69f11/verbs_followed_by_gerund_or_infinitive_quiz.pdf
    • https://uploads.strikinglycdn.com/files/73db3e5e-198f-4e3a-bc3d-fe377162ad85/grade_6_math_workbook_answers.pdf
    • https://uploads.strikinglycdn.com/files/57ce66f5-807c-4d5f-8a9a-da37ed699cfe/best_price_for_ti-83_plus_graphing_calculator.pdf
    • http://finatin.pbworks.com/w/file/fetch/144499905/youtube_freddi_fish_4_walkthrough.pdf
    • http://jebusolole.pbworks.com/f/famous_landscape_pencil_drawings.pdf
    • http://lakebimutep.pbworks.com/f/30533282131.pdf
    • http://munonoraze.pbworks.com/f/fovifup.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbaa.bin
a7ec8d9c19153483bebb0854e117433496d6907e81805c047ff5661fc8fc149a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 5648 bytes
font_01_sfnt_off0000eec1.bin
730636dc39987462e331c4da8042a0dedc6e1e2e506f1a5f4efa30fae674dbb6
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 11032 bytes