Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb3956381074637…

MALICIOUS

PDF

68.6 KB Created: 2021-02-19 17:46:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2a28013f1e76712917d7891db8dad271 SHA-1: 52098c92d2c3ee82099e41607c10868ae067c607 SHA-256: dbb39563810746376e29a03c82ef7eb939a33e8fb5f36ecf54690d06cd1ac720
214 Risk Score

Malware Insights

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

This PDF was flagged by multiple critical heuristics as malicious, specifically identifying it as a redirector link and a link farm. The embedded URLs, such as https://crophysi.ru/strik?utm_term=5+importance+of+text+structure+in+academic+writing, likely lead to phishing sites or further malicious content. The ML classifier and ClamAV detection further support its malicious nature, indicating it's designed to lure users to harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=5+importance+of+text+structure+in+academic+writing In PDF document text
    • https://cdn.sqhk.co/bezorufuv/ijdgf7t/drop_ball_gooseneck_hitch.pdfIn PDF document text
    • https://cdn.sqhk.co/dediwifime/gihiFa2/lafawulobaz.pdfIn PDF document text
    • https://cdn.sqhk.co/nolovojawek/dMql5gg/18537311618.pdfIn PDF document text
    • https://cdn.sqhk.co/wediximewoza/SFjncia/fake_call_prank_lite_girlfriend.pdfIn PDF document text
    • https://bemaxeviliw.weebly.com/uploads/1/3/4/4/134482954/womipej.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/lobosapifaner-lobamesux-xipibuxujejuton.pdfIn PDF document text
    • https://cdn.sqhk.co/gagobuniponi/h9hhnQA/nasikowenolebeku.pdfIn PDF document text
    • https://cdn.sqhk.co/joxipadij/i6iijdi/41277851758.pdfIn PDF document text
    • http://feyakast.online/terimolawefoxulapuzotoazjk.pdfIn PDF document text
    • https://bunojero.weebly.com/uploads/1/3/0/8/130874162/897d9605c0c4ba.pdfIn PDF document text
    • https://cdn.sqhk.co/lunajevon/yJhgf7t/xadizipow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD062 5632 bytes
SHA-256: 020ca14d9a9fb4ea9eaf2c68ef2625f996b870b76d7efd13d9a20e2960dd1153
font_01_sfnt_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 9916 bytes
SHA-256: 717f9c08e9e6b4d5181dacd2e02fccabfd4ff9980e78fb33aa696367ac1eb89c

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