Malicious PDF — malware analysis report

Static analysis result for SHA-256 368779b4a45abc28…

MALICIOUS

PDF

78.3 KB Created: 2021-02-23 13:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b9ecc18edabd43519a6b0a46df9ee95e SHA-1: 545385b190aa62a19ea0611fa6c9d04f7ee6056c SHA-256: 368779b4a45abc28501f647df4a5ef4a53a2f599b1803733395163030bd4bcca
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous URLs pointing to external PDF documents, some of which are hosted on disposable domains and redirectors. The primary purpose appears to be SEO manipulation or distributing further malicious content, as indicated by the presence of UTM parameters in some URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://yafferge.ru/strik?utm_term=what+will+land+first+a+feather+or+a+brick In PDF document text
    • https://cdn.sqhk.co/wazilisiko/Hjh6Ajh/tiwirixipazoz.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/ay8bqjh/strategic_thinking_examples_in_business.pdfIn PDF document text
    • https://cdn.sqhk.co/murefazomejo/bjdghhj/tumblr_malaysia_app_store.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuwutitaw/c1ChfQa/bakevikufoxizase.pdfIn PDF document text
    • https://cdn.sqhk.co/kavejufa/jdgjhgB/vikings_show_history_facts.pdfIn PDF document text
    • https://vavaxumepanev.weebly.com/uploads/1/3/6/0/136097425/dojemabidekirene.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/42f2c9f.pdfIn PDF document text
    • https://pezibife.weebly.com/uploads/1/3/4/3/134376528/giruxifu_mitubafikaw_jukinikani.pdfIn PDF document text
    • https://ruzuwigowan.weebly.com/uploads/1/3/1/4/131453288/6773964.pdfIn PDF document text
    • https://filukekab.weebly.com/uploads/1/3/4/4/134478490/gasizuwewa_xegugugepufe.pdfIn PDF document text
    • https://dozuveluxuse.weebly.com/uploads/1/3/4/5/134586722/lesegavixeg.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/Bhadfgf/xipoturelijixasiwini.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/eaOAniJ/food_safety_officer_kerala_psc_notes.pdfIn PDF document text
    • https://fasilusizewolas.weebly.com/uploads/1/3/5/3/135313848/zukodomovesawat_tikujebobik_voxefaz.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/tikoweravisixu/soxikale.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/37086518781.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/temple_run_brave_apk_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/police_crime_report_edmonton.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_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 5416 bytes
SHA-256: 13073019f3913919e34d0cc2564bc278e71bdd91ea017dae2dad091174720750
font_01_sfnt_off00010664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 11140 bytes
SHA-256: b482e1ce2186e62e1363926a4ea30d27cb95df86e0d259ea1d31688211080a0e

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