Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a9d05f4bf5f63a…

MALICIOUS

PDF

74.0 KB Created: 2021-04-03 05:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7db055c7e4faacf13626e373e985dd12 SHA-1: d10617d6a053471ebb477485843ef220cc768a46 SHA-256: b8a9d05f4bf5f63a3c0703282148782f51738b10949257d9eaef499f4d90602b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to potentially malicious or disposable domains, indicating a phishing or scam attempt. The ClamAV detection and ML classifier further support its malicious nature. The primary attack pattern involves luring users to external sites through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=office+tourisme+pays+basque+france In PDF document text
    • http://hayatevesigar.online/10_verbos_irregulares_en_presente_simple_en_ingles_y_espaolsp8hc.pdfIn PDF document text
    • https://cdn.sqhk.co/gavivevok/hG2TcXB/nusabiki.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/cMhasge/football_tycoon_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/bikulatitaxe/gi9ugfD/doferoba.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/i1hggVR/3225351314.pdfIn PDF document text
    • http://xefibusutama.22web.org/xaneniditonopu.pdfIn PDF document text
    • http://megatorg.ru/39352302049iqf9v.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/jeQ1lRQ/fosubozovalodedofube.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/bJxghu5/49719421760.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/rQRnPjj/oxygen_saturation_definition.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/duwokarewesu/iiajEI4/words_wallpaper_online.pdfIn PDF document text
    • http://uber-global.com/crowd_talking_sound_effect_download4quch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e42ce0b3-f376-4cb5-9abe-507fdbb9570c.filesusr.com/ugd/603474_a6708351386043ba9709a2481f107250.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_9a16dcf8f76f4eefa663572be6d30d82.pdf?index=trueIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_9cacf9421b39462188c595e5064f55cb.pdf?index=trueIn PDF document text
    • http://jusaxokipumata.rf.gd/88197794592.pdfIn PDF document text
    • http://bozitelededenox.epizy.com/administrative_law_notes.pdfIn PDF document text
    • http://vipotunopadilez.rf.gd/make_your_own_website_google.pdfIn PDF document text
    • http://gidepajujida.rf.gd/naruto_shippuden_manga_1.pdfIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_8064b987dc174dcaa2c19f9745a87959.pdf?index=trueIn 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_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 5524 bytes
SHA-256: bf139864124969c760b2ad823f0df86f71498c1cd7dbf4ee9e209657dd41f811
font_01_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 11224 bytes
SHA-256: 774ac38a867b10c8c649faaf2083802c8607ba6871b66acf3444a4a2e2b3b531