Malicious PDF — malware analysis report

Static analysis result for SHA-256 242011d38b5de9ae…

MALICIOUS

PDF

64.4 KB Created: 2021-02-10 09:17:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 463c9e8c7c914b641ad41e50051dce09 SHA-1: ce654e28d2c665f5be734dd5babcd5a4a126cac9 SHA-256: 242011d38b5de9aed4925a758f52e6268f3e314ca589d5c394c5ebe7410a9b3e
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 pointing to external PDF files hosted on disposable domains, indicating a link farm or SEO manipulation tactic. Several heuristics confirm the malicious nature of these links, with one directly leading to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yafferge.ru/aws?utm_term=bol+chudiya+bol+kangna+video++hd In PDF document text
    • https://cdn.sqhk.co/mujekesire/hdgfjaD/roman_empire_netflix_series_accuracy.pdfIn PDF document text
    • https://webemimerur.weebly.com/uploads/1/3/1/3/131380848/794a62268666.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/h7ghbhf/90s_pop_music_playlist.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/kimize.pdfIn PDF document text
    • http://wukifiduputafeb.22web.org/78464245537.pdfIn PDF document text
    • https://kurexutolik.weebly.com/uploads/1/3/5/3/135350225/xegulijutorowij-boxasom-garidezupigero-zomaf.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/fHFjHBj/born_year_of_jesus_christ.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/poechdd/xugevanonuwexuxuti.pdfIn PDF document text
    • https://cdn.sqhk.co/jilelemo/gd9khg1/farm_animal_coloring_pages_for_preschoolers.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/Y9hi2pw/1643585950.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/dgdAgbQ/lusetefo.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefoveniri/Uijghes/odd_eye_circle_album.pdfIn PDF document text
    • https://cdn.sqhk.co/tefaxobaf/ThfkVmH/pokemon_yellow_gameboy_color_price.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://konapawejiwevin.epizy.com/adobe_after_effect_cs4_kuyhaa.pdfIn PDF document text
    • http://revasaxoz.epizy.com/31061147290.pdfIn PDF document text
    • http://bidilud.rf.gd/nefemewexazemarobonulitob.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_off0000bce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE4 5344 bytes
SHA-256: 1e99d87da22d2be990f35b1e59a9a530e4807b1ad6e0c152db19a82c1bae6fee
font_01_sfnt_off0000cf1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1F 10808 bytes
SHA-256: 17117ee1d62c85d317c28d6414cd836a9d698b3512e5b00e058d423adafb2270

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