Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c03af03030ff635…

MALICIOUS

PDF

72.0 KB Created: 2021-04-06 04:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 32445b3ba931110c3431a39ef3d130b8 SHA-1: 181d02b2ade3a745467867450d8a6f159ec3fab2 SHA-256: 2c03af03030ff6359c8cc372226cf6626135e512b8bfc2aacb2a2400e9e5880c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/wix?keyword=all+about+genetics+webquest+answer+key PDF link annotation
    • http://creditpm.com/deboxiracij1h.pdfIn PDF document text
    • http://dress-russia.ru/wemadeduwibupasinixepm8mj.pdfIn PDF document text
    • http://bewujasixi.mywebcommunity.org/kusaviguzotix.pdfIn PDF document text
    • https://relibekagojuxi.weebly.com/uploads/1/3/4/6/134605829/zuxafaledipetafel.pdfIn PDF document text
    • http://kigirifaduguv.getenjoyment.net/17115999056.pdfIn PDF document text
    • https://zusonuxegaza.weebly.com/uploads/1/3/1/4/131437774/jegifizuzet_balazaxigetanad.pdfIn PDF document text
    • http://zofiziz.getenjoyment.net/russian_english_bilingual_dictionary.pdfIn PDF document text
    • http://899themes-demo.ru/roman_numerals_worksheet_for_grade_6ly2r1.pdfIn PDF document text
    • https://tasiwusod.weebly.com/uploads/1/3/5/3/135351817/9e2493cf.pdfIn PDF document text
    • http://sayseedokg.com/hyptis_suaveolens_medicinal_usesjidxc.pdfIn PDF document text
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/8664700.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/telis.pdfIn PDF document text
    • http://igme.site/science_weather_worksheets_for_kindergarten644mg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_4cfea047e3b7444dbbe8a0cd51bd1de6.pdf?index=trueIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_a552e7e449094dca88f33e00eba720f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b60f1d4a-4268-409c-9dd2-ae88598e10ea/jamaica_images_clip_art_stars.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/what_can_you_mix_with_air_in_little_alchemy.pdfIn PDF document text
    • http://rinimodosejowuf.myartsonline.com/xenopekakuvepematekom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6935bac5-078a-41ac-8d03-717671413459/kifurokapokuluwaguvigitan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc9fa362-b121-4aa8-b9cb-42c2b0ec86b1/8452280682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5720a34c-ae1f-4991-82c9-db3b3c65e25c/estudios_bblicos_cristianos_evanglicos_escritos.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_7c7b34a11476475f8afbd40664cc9e74.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/54114ad2-7347-4019-be9a-480426eb3a51/798091754.pdfIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_403dfc3eb0734bdfad2385c71e3280c4.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_off0000da64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA64 5480 bytes
SHA-256: 9c89c00244f13ad0de546e5b11db4055d692cbbeda01308d8274328e20e50c87
font_01_sfnt_off0000ed30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 10764 bytes
SHA-256: ba1ac6fc4d0964defbfa3c2cc412a59b6afda181584ea007032ffb7b74999fd5