Malicious PDF — malware analysis report

Static analysis result for SHA-256 948b1936ecfb7372…

MALICIOUS

PDF

71.0 KB Created: 2021-02-18 14:59:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1f1cad0b70d78a07e099c781e77248e2 SHA-1: 629cfd8470b90171b088f21c08059fc12b11765c SHA-256: 948b1936ecfb737236d27ac4dbf4034519051bcd12e650d508735049ff6a8d5f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to trick users into downloading further malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=bose+wave+music+system+manual+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413575/normal_5fec865017ea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_601b29a8007bf.pdfIn PDF document text
    • http://reawont.online/fanatical_car_driving_simulator_mod_apk_hack940cn.pdfIn PDF document text
    • http://moreprodukti.com/55203882050uwr86.pdfIn PDF document text
    • http://repochka.site/awadhesh_premi_bhakti_songye4ah.pdfIn PDF document text
    • http://copyrighthelpcentral.com/55941122353emdmd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366627/normal_5fff7ee1898a3.pdfIn PDF document text
    • https://dedodewoluxo.weebly.com/uploads/1/3/4/4/134402612/manejobisipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449001/normal_600dbce2eda57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479435/normal_600ff8b28ac4e.pdfIn PDF document text
    • https://dakikizubebara.weebly.com/uploads/1/3/4/8/134889455/vexetukalutine-tozetavez.pdfIn PDF document text
    • http://cccckkkkkdd.space/genie_model_2022_keypad_programming5wj8a.pdfIn PDF document text
    • http://circulshtangcalip.website/sowolusebezomanorapebifucvhr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_601b3c5f30fbb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/granny_pc_windows_10_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/fusorubijapumi.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/is_astro_a50_compatible_with_ps5.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_off0000d8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B3 5292 bytes
SHA-256: 6d5e4bd84b4db0493a30454fb2d8faf0f4d895fee156348c29b5b85ccb812603
font_01_sfnt_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 10420 bytes
SHA-256: de0914436360d7818c2e3acf12e0c27307b0a8e66e202573421d8a5deb7a998b

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