Malicious PDF — malware analysis report

Static analysis result for SHA-256 04fc811d5752aca9…

MALICIOUS

PDF

79.7 KB Created: 2021-02-21 14:24:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ffa865cd2c5186638e9e8a915105344d SHA-1: a75d6716cd61e83a616ebcdb2003600a9721eff3 SHA-256: 04fc811d5752aca9dd87c7a310fcfbbdfddc89089f6859e92bb9734ed9598b01
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though obfuscated, contains keywords related to 'Oreck air purifier parts', suggesting a lure to entice users to click the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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/123?utm_term=oreck+air+purifier+parts In PDF document text
    • http://4338bacchus.com/5301451562w03vz.pdfIn PDF document text
    • http://topmassage.net/807191190963ex30.pdfIn PDF document text
    • https://xesanojazal.weebly.com/uploads/1/3/0/9/130968931/2432761.pdfIn PDF document text
    • http://finovadi.iblogger.org/dc_cheetah_3d_model.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/2523979.pdfIn PDF document text
    • http://fojedera.22web.org/a_thousand_years_song_djmaza.pdfIn PDF document text
    • https://widedajixefur.weebly.com/uploads/1/3/5/3/135312737/todonelek.pdfIn PDF document text
    • http://taxurofetizi.22web.org/18555839160.pdfIn PDF document text
    • https://makojinoguj.weebly.com/uploads/1/3/1/4/131406607/f8640.pdfIn PDF document text
    • http://electorat.org/35297039788j4tpr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nibudikugi.epizy.com/9707711527.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/vba_force_uk_date_format.pdfIn PDF document text
    • http://bakilipos.epizy.com/gw2_weaponsmith_guide_dulfy.pdfIn PDF document text
    • http://gomekojesigir.rf.gd/easy_touch_apk_onhax.pdfIn PDF document text
    • http://diwuzenebixo.epizy.com/37241539468.pdfIn PDF document text
    • http://zonadomafi.rf.gd/80815188057.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/69106450542.pdfIn PDF document text
    • http://bomigezi.epizy.com/nagizegigajobu.pdfIn PDF document text
    • http://vininotubosom.epizy.com/finelujemedanaxukumabidun.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_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 5068 bytes
SHA-256: 68a6a3d224300e7d7ee1fea4971ab7a668b985d2d412c452748e1df0bda06813
font_01_sfnt_off00010cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 10868 bytes
SHA-256: 574327930027912573281df87f363e68a988775ce1771b5c52b932be8b7164fa

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