Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bfc2491aea9839…

MALICIOUS

PDF

79.4 KB Created: 2021-02-13 05:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: abdd5a96c9bf6e5a086af87f857f9cfc SHA-1: 62ac05d288fdc5f107682f0f7293748dde3e7257 SHA-256: a3bfc2491aea98394136f06e19763264b9d829bcbdfdd6a1c17dc07b74300401
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, identified as a link farm, with several pointing to known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the presence of numerous external links suggests the primary goal is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/wix?keyword=neron+dc+fandom In PDF document text
    • https://cdn.sqhk.co/jasojime/eheZR3C/mumilekuz.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/4f6Ci2z/baraxadijozufisen.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/hzlRUjj/gogo_live_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/4ihgigi/stipop_stickers_for_chat_app.pdfIn PDF document text
    • http://podarokinsta.online/93235451498k2nkn.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/pevavuperabijino.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/iiPyEJT/iphone_x_ringtone_free_download_high_quality.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/6V8LxbT/kupem.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/Rnggwja/sliced_bread_recipe_ideas.pdfIn PDF document text
    • https://gojojiwegojefuw.weebly.com/uploads/1/3/2/6/132695574/3894127.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/jdibQhh/origami_flower_vase_step_by_step.pdfIn PDF document text
    • https://kagesurofuzesik.weebly.com/uploads/1/3/5/3/135303772/natigedupimu-tadixudofolir-wilagorarun-nikaw.pdfIn PDF document text
    • https://cdn.sqhk.co/xelibini/giiihjp/amiibo_navirou_monster_hunter_stories.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/dMClgfp/13260566207.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/Zhgzii7/siwowajoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/jfyThbG/24690199693.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/zijivevip/xibijipidolax.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/fasuduwirojefoxu.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/mipojepemopavobob.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/facebook_videos_online_mobile.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_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 4928 bytes
SHA-256: a90c671f1f07f5d95ae128dd6df37d8fab84c337ebe729289f021477aa507339
font_01_sfnt_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 10316 bytes
SHA-256: 313c76490eebd75496becb3e95490d18a7c0d338e96a84c2c000301d3cac047b

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