Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be830433c027629…

MALICIOUS

PDF

82.6 KB Created: 2021-03-24 17:27:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4768e12377ff5b0e1b4e54ea97ad8f56 SHA-1: c7b625ca1023d1ec8a9e47b09ca5a0314f4ddaa3 SHA-256: 9be830433c0276297abe17a302b78c5e7046bd2fcb666b5a2e5038f0b9cb2580
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to disposable hosting services and redirectors. The primary malicious link, https://dafemum.ru/award?keyword=set+theory+proofs+pdf, is flagged as malicious. The document's structure and link farm behavior suggest it's designed to drive traffic to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF's nature and embedded links strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://dafemum.ru/award?keyword=set+theory+proofs+pdf In PDF document text
    • https://zifaxigelu.weebly.com/uploads/1/3/4/7/134720210/5ab86c.pdfIn PDF document text
    • https://mopamosaxute.weebly.com/uploads/1/3/5/3/135322262/mapabadasisira_bumemosujape.pdfIn PDF document text
    • https://kepinofex.weebly.com/uploads/1/3/4/0/134017679/2622327.pdfIn PDF document text
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/lajafopa.pdfIn PDF document text
    • https://bokesavuxi.weebly.com/uploads/1/3/0/9/130968985/8858584.pdfIn PDF document text
    • http://idealica-ordina.site/jusupazujagaluwb7c8r.pdfIn PDF document text
    • https://vilujelirajoki.weebly.com/uploads/1/3/4/3/134378771/2586627.pdfIn PDF document text
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/reduregumu.pdfIn PDF document text
    • https://sesanejaw.weebly.com/uploads/1/3/1/4/131407178/wisuzofe_dadovoji.pdfIn PDF document text
    • http://francobusiness.com/dengue_guidelines_cdcye58m.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/8773395499.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/2162530.pdfIn PDF document text
    • https://mojulikobamod.weebly.com/uploads/1/3/4/4/134488450/nopomamoluvuxi-runetokola-xafapini.pdfIn PDF document text
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/8130038.pdfIn PDF document text
    • https://xiboraritaro.weebly.com/uploads/1/3/4/4/134464700/8635761.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/what_is_power_and_politics_in_the_workplace.pdfIn PDF document text
    • https://soridafufunet.weebly.com/uploads/1/3/5/3/135308698/jomeve-tegomudigidabi-datalisik.pdfIn PDF document text
    • http://axecheat6.xyz/private_download_apk_uptodownzvaf1.pdfIn PDF document text
    • https://zasiranel.weebly.com/uploads/1/3/4/5/134507270/85b14f896.pdfIn PDF document text
    • https://vewuwoxefi.weebly.com/uploads/1/3/1/3/131379256/diwesetajevavug.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/20e77633a7f248.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faleferesevo.onlinewebshop.net/tratamiento_anemia_en_embarazo.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_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 2112 bytes
SHA-256: d38178c05b75bae2e5aa3667c6a6b48c6ea63af35738ac9c4dbc064e4f591e9d
font_01_sfnt_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 5092 bytes
SHA-256: fc95bd0c170abf760d7ebcc6607ef1520fa62ff8bd328396fea83f937dbf910e
font_02_sfnt_off00011400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11400 11472 bytes
SHA-256: 7d982be20a03481f98919c4e17ad1fec3ecd2c8ad745f003baec0d8c2ee4d07c

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