Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a96f4826d36b39…

MALICIOUS

PDF

66.9 KB Created: 2021-02-20 16:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 6a88fb0d7c9466921417ef82f2a253c2 SHA-1: 12f378481533a11089389fe317d17093d2899176 SHA-256: 71a96f4826d36b39ac043a35c6ea47ae58e9f1b4d79677db12a77a2bd63c0117
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/aws?utm_term=how+to+make+construction+site+visit+report'. The ML classifier and ClamAV also flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL strongly suggests an attempt to lure the user to a compromised site, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/aws?utm_term=how+to+make+construction+site+visit+report In PDF document text
    • http://ig-support-service.com/94371809879occs7.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/ieHhggi/vaguwojimirotakega.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/hifFgfJ/shake_the_monkey_game_2.pdfIn PDF document text
    • http://zarabotok.space/bengali_album_song_siteoz8q0.pdfIn PDF document text
    • http://paksorond.xyz/55371813107ofn88.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/lqibpn4/blockchain_technology_in_healthcare.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/sitozi/neoliberalismo_resumen.pdfIn PDF document text
    • http://nototen.epizy.com/9523332858.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/60058168505.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/32584523470.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/mutusawas.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/watch_kannada_movies_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/swing_type_check_valve.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/23685322909.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/66835270633.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_off0000ca44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA44 5224 bytes
SHA-256: 992c36fdf3664119fbf84eaa59a0c5cb02a69376e076140aa8152a0149dc4350
font_01_sfnt_off0000dc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 10112 bytes
SHA-256: a63d2c4b7e9317ea740e55fd2a0d3f802e49cc6674f0f679fc0835234f3aaae1

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