Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b77fe70209874d…

MALICIOUS

PDF

85.1 KB Created: 2021-03-16 04:50:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 08eb15eae0ed6fe61aac369f054acd5b SHA-1: f48ce6334748fb791483e780b5718f132feebb78 SHA-256: c6b77fe70209874dc91e13637d00ce9eaad17205523db7cde13882c34d32f0e5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a strong intent to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the use of multiple disposable hosts for hosting PDF files, suggesting a campaign to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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://golowaki.ru/123?utm_term=aromaticity+pdf+file PDF link annotation
    • http://trikolor.site/pakukiv32nuh.pdfIn PDF document text
    • http://goworudubilit.iblogger.org/25923383181.pdfIn PDF document text
    • http://laithub.pro/sowatgbiqu.pdfIn PDF document text
    • https://pukelubaluwo.weebly.com/uploads/1/3/4/7/134741361/xagifezonirijedadowe.pdfIn PDF document text
    • http://gukapeb.iblogger.org/1969534146.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/hhX2haW/photo_studio_equipment_takealot.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/ieicjjh/photo_lab_picture_editor_fx_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/eieibhf/kerufar.pdfIn PDF document text
    • https://cdn.sqhk.co/neguvobipa/nc0igje/40827300179.pdfIn PDF document text
    • http://dulexip.22web.org/basic_exponent_properties_worksheet_algebra_2.pdfIn PDF document text
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/9057173.pdfIn PDF document text
    • https://jerupixudenaxi.weebly.com/uploads/1/3/1/4/131437293/48e709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374181/normal_600c11c19d6da.pdfIn PDF document text
    • http://xtrading.buzz/r_programming_for_dummies_free_download_freedb7fb.pdfIn PDF document text
    • http://realwockyc.info/lumisofedasevikelivomatzdrl.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/ih6hijh/pajuxalonugobalazosexuxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5ff7b0f41f75a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409118/normal_5fddde6c6e163.pdfIn PDF document text
    • http://inglassrus.ru/wafasopitomutiwafajozasn357.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/rubipumenixa_kepirexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483103/normal_602261cbf4111.pdfIn PDF document text
    • https://revixapega.weebly.com/uploads/1/3/4/6/134619396/sepedovu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418587/normal_60055c9b54232.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wawutanow.epizy.com/81780639467.pdfIn PDF document text
    • http://xumugipetoje.epizy.com/kinujixaf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 5212 bytes
SHA-256: 988a91e95ed936dfa53cb1227bf1c14b614f558923ed739ff85f65a5954f2fbc
font_01_sfnt_off00010da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA6 10412 bytes
SHA-256: a0eb04e4eda68c4e2404ce4046d989de7a59bf39c3feb5bbfe7bf39634bf4c06
font_02_sfnt_off00013179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13179 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449