Malicious PDF — malware analysis report

Static analysis result for SHA-256 3645700d2808aef0…

MALICIOUS

PDF

79.1 KB Created: 2021-03-02 09:43:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6fef419eb5dbe565d4874e265d793453 SHA-1: db84c673e15793f137cbe720214d393ae427557f SHA-256: 3645700d2808aef01f565189fe46c0791ce5334aa104e606e745e2fac72bd68b
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The PDF structure and embedded links suggest an attempt to redirect users to external, potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=elementary+geometry+for+college+students+7th+edition+solutions In PDF document text
    • https://cdn.sqhk.co/tesolivu/ghypgjf/68392808312.pdfIn PDF document text
    • https://duvozogol.weebly.com/uploads/1/3/5/3/135314926/daxopigujajul_sowujovukiwavor_fuvozosubuser.pdfIn PDF document text
    • https://dusuwepi.weebly.com/uploads/1/3/4/5/134589125/ponikalukawava.pdfIn PDF document text
    • https://cdn.sqhk.co/tojebaru/g77ghQo/weekly_class_planner_printable.pdfIn PDF document text
    • http://mx50off.pro/arya_telugu_movie_bgm_musich51yu.pdfIn PDF document text
    • http://womenit.space/83683833553y5b85.pdfIn PDF document text
    • https://sekojeti.weebly.com/uploads/1/3/4/5/134583019/dinode-mufofos-rarifesukut-leraxodotube.pdfIn PDF document text
    • http://app-3null.com/golden_boy_clifford_odetsa7ixx.pdfIn PDF document text
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/xasifowarulapobaxove.pdfIn PDF document text
    • http://present-mag.ru/cactus_band_mp3_song6d0ix.pdfIn PDF document text
    • http://grigolia-studio.ru/tobogabuxekepemirivog6tamn.pdfIn PDF document text
    • http://kinoogf.space/77_ways_to_play_tenzi6s2d0.pdfIn PDF document text
    • http://checkmycredit.info/3512776053661tbm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nipuwiwabo.rf.gd/budget_plan_template_free.pdfIn PDF document text
    • http://bosirizowu.rf.gd/99727355397.pdfIn PDF document text
    • http://gijufebevavudep.rf.gd/zobewabiruma.pdfIn PDF document text
    • http://timaroxakex.epizy.com/broadsheet_melbourne_italian_restaurants.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_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 5576 bytes
SHA-256: 57974bda5d99b263e50daa88ba432c81e21f2effcf99ee7f6a0768924610bff4
font_01_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 10980 bytes
SHA-256: b5ce8c0c815c935ade8df8f6dfa5ca9267fce5673e58b454dc598c47730c83b5

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