Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea13ac0f905e598…

MALICIOUS

PDF

81.1 KB Created: 2021-03-05 05:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 09652c66a0071a9c3bf9596c756c0981 SHA-1: b3f37b34546d64fcd6e1a890026045fdd3f4d0ff SHA-256: 8ea13ac0f905e5988b138f45590bead483f4c5159e654e1d1f43ba45be86b0c7
244 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam campaigns. The document body is heavily obfuscated and contains no readable content, suggesting it serves primarily as a container for these malicious links.

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
  • 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://crophysi.ru/123?utm_term=delta+model+22-560+planer+blades In PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/e356cd7a493c628.pdfIn PDF document text
    • https://jamelowo.weebly.com/uploads/1/3/1/6/131606155/08e1ea7679f.pdfIn PDF document text
    • https://cdn.sqhk.co/zoburawava/m1Pgegj/british_superbike_2010.pdfIn PDF document text
    • https://cdn.sqhk.co/vubiwete/jjNgdsO/roxeduzufodirej.pdfIn PDF document text
    • https://rotowoboragidak.weebly.com/uploads/1/3/4/5/134508058/jisituxifofude.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463300/normal_5fcd74eb6fc9b.pdfIn PDF document text
    • http://misstourist.info/a_woman_in_berlin_full_movie_online_freem56xb.pdfIn PDF document text
    • http://tegor.xyz/phonetics_and_phonology_bookc9yta.pdfIn PDF document text
    • https://valojeruxul.weebly.com/uploads/1/3/4/6/134681631/1910623.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/cgiooha/sculpt_it_instructions.pdfIn PDF document text
    • http://fertpin.online/assassin_s_creed_pc_game_listii3qu.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/wggg5gc/you_that_man_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/Mmgjgfu/iron_stickman_rope_hero_fighting_gangster_crime_city.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_601dd0b787a55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a9d68ec8-094c-4f36-a6bb-d213f860e515/schwinn_fitness_ic4_coupon_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb784e8-dd4d-45a1-af71-0b3e68a6b221/12324734507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05be4863-1442-4633-80c5-901ea34c2417/why_is_my_wireless_keyboard_not_working_logitech.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb9bb3c-b871-48a8-a3fd-8ce0fc962041/48248271674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13bc52c2-62c7-4c8f-8c0b-d7970e63cd7a/jesarajuwinafonosor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cfad127-1aa0-43da-a554-1cf2f89cb94a/94852237737.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83e5b19a-f63a-4924-8b26-8f8a0ca75f52/gejexabowiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7bd4ce-4463-499b-99ef-e0bd7e348df4/jabra_cruiser_2_reset.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 5568 bytes
SHA-256: 7963c638312294a4494bff0fad0aaba7dd5e779abb8c2d582f2b0925f09f23c4
font_01_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 10696 bytes
SHA-256: bbc38addc060769f6f5898683bbdcfc0306e7ab63a648c336ec5116e23b80cba
font_02_sfnt_off00012901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12901 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333