Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61bc778ed540e44…

MALICIOUS

PDF

81.2 KB Created: 2021-01-30 14:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a2d89deee3b715cc77a26c171dbbdc77 SHA-1: 777b1cfd04ef828f7fb0f3ad26a69e9c136ae704 SHA-256: d61bc778ed540e447eac14f39c68bf911ba4fcbad76e71126fdffe266e98e8b9
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known redirector infrastructure or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to malicious sites for further exploitation.

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 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://traffmen.ru/wb?keyword=survival%20craft%20mod%20apk%20revdl In PDF document text
    • https://cdn.sqhk.co/nowovadizeb/geCzhfX/65082859563.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/QhgBEag/light_superhero_speed_hero_robot_rescue_mission.pdfIn PDF document text
    • https://cdn.sqhk.co/tujuvemevo/fvVibn3/62759132782.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/o8GhbRm/7544408859.pdfIn PDF document text
    • https://cdn.sqhk.co/vomikigiw/SggxyD6/esl_lesson_plan_free_time.pdfIn PDF document text
    • https://cdn.sqhk.co/jarutejip/Fibhh6w/zexewuzojilodararemo.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/ifhdxhg/highway_racing_game_download.pdfIn PDF document text
    • https://dalatomim.weebly.com/uploads/1/3/4/3/134344090/lebomuriligod-turejupire.pdfIn PDF document text
    • https://forupiwiwipugo.weebly.com/uploads/1/3/5/3/135349306/7494223.pdfIn PDF document text
    • https://cdn.sqhk.co/navuwamas/tifjehg/formula_1_2020_game_xbox_one.pdfIn PDF document text
    • https://cdn.sqhk.co/gurudulep/qhbWdgf/vitidukafivaxaw.pdfIn PDF document text
    • https://lipuxavevafip.weebly.com/uploads/1/3/1/3/131398459/karate_timoj_medakevexoxiwaj_dijebozizokiw.pdfIn PDF document text
    • https://xibemorebag.weebly.com/uploads/1/3/4/3/134355918/xikonasifegokod.pdfIn PDF document text
    • https://cdn.sqhk.co/pilimisoduk/Nhetthd/tamil_hindu_devotional_mp3_ringtones_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/aRghZRN/23052547567.pdfIn PDF document text
    • https://cdn.sqhk.co/komilede/fjjjcQN/tibakimularedizevuto.pdfIn PDF document text
    • https://puzejiwitamino.weebly.com/uploads/1/3/1/4/131453698/jomimasaw.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 5352 bytes
SHA-256: bf35aa5305d072a5d296a77651bee0b5e5e71607630aa436bbe8c98c0bddf7a1
font_01_sfnt_off0000fb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3F 11848 bytes
SHA-256: df8205cf13ed3b6f53716158659bd7a33614d3494923d00948bc221fb163eea1
font_02_sfnt_off000122aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AA 16092 bytes
SHA-256: 0be84d2d0547f1f02aa0071b49020aaa73ac7e6a4c4dee27a4da8627c6f2d0ef

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