Malicious PDF — malware analysis report

Static analysis result for SHA-256 a163f04b236150b7…

MALICIOUS

PDF

98.2 KB Created: 2021-03-25 22:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 016e1a7554574a18abe5b70df8b08857 SHA-1: ad2106df150280be361d2457dedf5c32cdc4d66b SHA-256: a163f04b236150b7eef98b66b671f049d33239be42d1aee8e96e2963596297f9
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be metadata rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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/award?keyword=administra%25C3%25A7%25C3%25A3o+da+produ%25C3%25A7%25C3%25A3o+slack+pdf PDF link annotation
    • http://lnstagram-help-businesss.com/pagalword_bhojpuri_bhakti_song_2018fytxi.pdfIn PDF document text
    • https://cdn.sqhk.co/popaxutu/ghAInjd/cube_surfer_app.pdfIn PDF document text
    • http://blognews.top/499845098708hk90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414360/normal_60384cde1f4a7.pdfIn PDF document text
    • http://wekeb.space/slingshot_price_car9l7wv.pdfIn PDF document text
    • https://cdn.sqhk.co/farosexuto/5M9FNjn/35443117105.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/gdXjchj/dovisufugoduxefo.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/pgfduhe/74455773467.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451365/normal_6007571940111.pdfIn PDF document text
    • http://newyearshop.site/araro_ariraro_kannada_song_freegqi44.pdfIn PDF document text
    • http://activa-fb.com/embedded_systems_real-time_interfacing_to_arm_cortex-m_microcontrollers9usq9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411923/normal_60463949ed5c7.pdfIn PDF document text
    • http://kismykeitio.best/john_deere_x360_for_saley6yvd.pdfIn PDF document text
    • https://cdn.sqhk.co/zemakojunil/jiWhgq6/32165605369.pdfIn PDF document text
    • http://maykistore.ru/what_is_power_circle_diagramtw4yn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475859/normal_601ba6a3ba6f9.pdfIn PDF document text
    • http://chelobaka.space/diaper_genie_bags_how_to_usekk3ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_95bf80695e71471bb4ab6cc8c677ab41.pdf?index=trueIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_c46075632a4f42439ead21a935964565.pdf?index=trueIn PDF document text
    • https://1df32be7-5e6a-491e-80e4-5c558052ef26.filesusr.com/ugd/e02e08_f56259f4bd3749e1a9a31348f4102918.pdf?index=trueIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_fe94377326ed40ba9d9cba879a2d0da9.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
    • 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_off000124a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A6 5856 bytes
SHA-256: 98aea779fa1009663bf5924bbc8945c6970632ba1b0d69717647b7ffa541be69
font_01_sfnt_off0001379e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379E 15112 bytes
SHA-256: 50ea180fcc253839925a10abe0b2ce57c6fd8a9422f03b80836d13c13b75b9ba
font_02_sfnt_off000163c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C9 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd