Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d865d32768bc6a…

MALICIOUS

PDF

81.9 KB Created: 2021-04-29 22:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 175815ba79d42d16af7371da00fd4392 SHA-1: b42fd1e4219e5f8f81e04d7c9da95e19aaf3dd4b SHA-256: 38d865d32768bc6ab9772f89b8de5e3e10d22c09fed07974a559447a638ae4bc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The primary URL, https://ponafet.ru/strik?utm_term=do+beats+solo+wireless+have+a+mic, is suspicious and likely leads to a phishing or malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=do+beats+solo+wireless+have+a+mic PDF link annotation
    • https://cdn.sqhk.co/bujugasefoli/jjcgdgg/coin_counting_machine_near_me.pdfIn PDF document text
    • http://patedeziw.mypressonline.com/39405459704.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/hjdvhgw/moxenulutidugavadewaba.pdfIn PDF document text
    • https://cdn.sqhk.co/xanapaje/fWrhghe/26148375937.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/inkscape_tutorial_jpg_to_svg.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/lje2gcx/note_taking_tablet_e_ink.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/fogibi/dynacord_l1800fd_datasheet.pdfIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_df72a1c6364f4a78a87b4bbf0514e626.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01f1bd39-208d-444b-96b7-5cacb5ffeb81/98756027312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab9921a7-41b4-4e96-a80b-cca5bc126a7c/when_someone_hurts_you_quotes_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/vocabulary_workshop_level_f_unit_5_synonyms.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_e8f4453277384c368b45256612421cb5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fdbbee3-2350-47ba-9f0c-4b4172f54cba/are_inverter_generators_worth_it.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35e307b-b6fa-40d7-944a-9ee5f9c2c652/how_to_speed_up_an_edpuzzle.pdfIn PDF document text
    • https://eeebefec-a839-4a3a-9f85-40791d64ec9d.filesusr.com/ugd/4cd51e_e1cad2479f3a4daa9d1d5435f71c441b.pdf?index=trueIn PDF document text
    • http://rewuwuja.onlinewebshop.net/bsc_botany_syllabus_du.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9df8223-4711-4804-b145-13528de0afb0/is_state_of_emergency_in_the_constitution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f909edd-fc37-4069-999b-a137068d42ea/59184966733.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_off000100bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 5332 bytes
SHA-256: 24c1e127fc2cbea1faf7f96d9dc9f7cce2c3b106d0a9a1d46f72c7bd34218f21
font_01_sfnt_off000112d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D3 11892 bytes
SHA-256: 7f0892358c7e61ca42e7f92c6ce41b3bbf97884d1ae96f13b0c16592158f2b17