Malicious PDF — malware analysis report

Static analysis result for SHA-256 548c4369fea6e8a3…

MALICIOUS

PDF

78.3 KB Created: 2021-04-27 14:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 05d8ff0bd6e9c880ca756f2c5b17f170 SHA-1: b1f43bfb2198c25606fd0f23bef3eb4f59af07af SHA-256: 548c4369fea6e8a36a135534fdb7f4f86ba326073ca3dc06bf140758d31fdee9
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and redirectors, indicative of a link farm used for phishing or spam. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious websites.

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=ruud+water+heater In PDF document text
    • http://aov.one/supermarket_cashier_job_description4zcew.pdfIn PDF document text
    • https://palekamenagogu.weebly.com/uploads/1/3/2/6/132682235/7200912.pdfIn PDF document text
    • https://juxagoneponux.weebly.com/uploads/1/3/1/3/131384300/feluki_jabewevawanufob_megijusitepa_sulofokoxetuzew.pdfIn PDF document text
    • http://gawudubigojan.getenjoyment.net/49959029891.pdfIn PDF document text
    • http://usesalle.xyz/the_essential_vegetarian_keto_cookbook_reviewsgc9h0.pdfIn PDF document text
    • http://docita.fun/45040927386ph8ne.pdfIn PDF document text
    • https://cdn.sqhk.co/nevenupixe/ljjgeib/19863964239.pdfIn PDF document text
    • https://pavadugubuwab.weebly.com/uploads/1/3/4/3/134309483/d81ae6924a99.pdfIn PDF document text
    • https://rinulokol.weebly.com/uploads/1/3/4/8/134868038/2440723.pdfIn PDF document text
    • http://ptmonline.ru/sadlier_vocabulary_workshop_level_e_answers_unit_1557w3c.pdfIn PDF document text
    • https://zopojezumaze.weebly.com/uploads/1/3/1/6/131637354/2e58fdcd64.pdfIn PDF document text
    • http://soul-felt.com/bifemavelgc49.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/ifVbifS/parallel_space_multi_account_latest_apk.pdfIn PDF document text
    • http://mopowataxix.medianewsonline.com/sunbeam_gas_heater_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wevujonixusenex.rf.gd/30625367213.pdfIn PDF document text
    • http://jamoxesadesoxa.rf.gd/amiotrofia_neuralgica.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 4420 bytes
SHA-256: ac4b380eff7692fb08cd7967eee64088e70ff7ba53d67d396f6a1ab1d5632a82
font_01_sfnt_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 10884 bytes
SHA-256: d84bce615725ef7c5913d3edc304b95f5f8a288f3c8289beae643d0d3128fd69
font_02_sfnt_off00011e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E48 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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