Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c1666f81baeb2b…

MALICIOUS

PDF

71.6 KB Created: 2021-05-11 11:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 75885e505632fc79c7eede0b01b3e16f SHA-1: e3b31f7e2c886a734613ff5b0a53a41951b57d5c SHA-256: 57c1666f81baeb2b33c463b86293cee7192c20f380c9baad12af69fe50800549
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farm SEO spam or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://nipisod.ru/strik?utm_term=how+much+does+a+health+information+technology+make+a+year', suggest the document is designed to redirect users to potentially malicious content under the guise of providing salary information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nipisod.ru/strik?utm_term=how+much+does+a+health+information+technology+make+a+year PDF link annotation
    • https://vowinerini.weebly.com/uploads/1/3/4/3/134385114/80bf50f3c48900.pdfIn PDF document text
    • https://favadela.weebly.com/uploads/1/3/1/0/131070298/bires_videzozapok.pdfIn PDF document text
    • http://avto-document.site/putinavovudb5k7f.pdfIn PDF document text
    • https://kurepisafigovu.weebly.com/uploads/1/3/1/3/131398088/dizobuzu.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/63028579820heqmy.pdfIn PDF document text
    • https://xavujome.weebly.com/uploads/1/3/0/7/130739328/273a0b.pdfIn PDF document text
    • https://legopaxazomunan.weebly.com/uploads/1/3/5/3/135396831/vivomin_fegujob.pdfIn PDF document text
    • https://taxudomajifi.weebly.com/uploads/1/3/4/1/134108655/gezanodibewebok_pojajajisaxoti_forapozakujozig_mevokitizeje.pdfIn PDF document text
    • https://liramuxusere.weebly.com/uploads/1/3/4/5/134577046/3963329.pdfIn PDF document text
    • https://kexezesokofu.weebly.com/uploads/1/3/3/9/133986719/zuburilut.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://xemakoxen.weebly.com/uploads/1/3/4/3/134320116/pexefusuxotiferiru.pdfIn PDF document text
    • https://faxezufag.weebly.com/uploads/1/3/0/8/130874059/6034653.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/01ebc588-abc8-4ac9-b6c4-1a53d5a84025/how_to_fix_dish_network_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/how_to_write_a_suspense_story_ks2.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/command_and_conquer_generals_full_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/53743759103.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/67184361845.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/dusamesimenisewosolikaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b26b52cc-9659-49b4-8fba-b035b5ce1f3e/alpha_phonics_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fac60dc-d768-4017-a82c-461334a7566e/where_to_put_liquid_detergent_in_bosch_front_load_washing_machine.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_off0000da2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2B 5652 bytes
SHA-256: 15ee897c50c7c60e1f30942641e3eaf100ebcadd326f25c1cda2a2e3467052ce
font_01_sfnt_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 10364 bytes
SHA-256: 0961e00ec7636b297daa1efa336737ebf64cb646a6c6eb2cf3dae02ce4b3343f

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