Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac33a210d74e153…

MALICIOUS

PDF

76.7 KB Created: 2021-05-04 06:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1996a99bcb468803618fa3cf29d5d2be SHA-1: 3a140605c1120dfe002e61491b6fb8621e489bde SHA-256: bac33a210d74e153822637a3a6a2722fb68349cecbeb78636a6c4c556b06749a
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure (https://yafferge.ru/strik?utm_term=devotions+for+married+couples+app). The file's structure and embedded links suggest it is designed to trick users into visiting these malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/strik?utm_term=devotions+for+married+couples+app In PDF document text
    • http://godumos.22web.org/790914913.pdfIn PDF document text
    • http://zanakodus.22web.org/munisejomexuw.pdfIn PDF document text
    • http://jobediniberine.scienceontheweb.net/nirej.pdfIn PDF document text
    • http://govugododuwo.iblogger.org/jezajapizavelepi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377112/normal_6066906a8b10c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448718/normal_5fec3f7ab42a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3bff7fa-f232-45d8-99a9-4f4cd086671f/winchester_ranger_34_gun_safe_for_sale.pdfIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_81c935390cbc4dbe92c1f73f6cde127b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbfcb6da-1531-4941-852b-7dab829f4a6a/the_land_of_stories_book_1_audio.pdfIn PDF document text
    • http://pivimufe.atwebpages.com/20_mathematical_symbols_with_their_origin_meaning_and_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cedf84ee-b345-4fd5-9f08-8e076a66f0da/basic_english_grammar_in_marathi_free_download.pdfIn PDF document text
    • http://kagiwabiluwotel.epizy.com/purorodovowodored.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_f57cc704801b4bfd87442b67d1c6c748.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_d20a7d0a9ab848c5ae06c4c83291ae4e.pdf?index=trueIn PDF document text
    • http://vawigopowapab.rf.gd/8571331828.pdfIn PDF document text
    • http://werowelunan.epizy.com/rigikot.pdfIn PDF document text
    • http://zemigubu.epizy.com/how_much_do_maritime_lawyers_earn_in_south_africa.pdfIn PDF document text
    • https://36d3fe4d-ce77-4ecd-ae21-04b42370c250.filesusr.com/ugd/871c54_35c0e94d91964a7e85a0dbbe99b45178.pdf?index=trueIn PDF document text
    • http://famomijis.onlinewebshop.net/91326463081.pdfIn PDF document text
    • http://bezepegu.epizy.com/w-_4_personal_allowances_worksheet_2019.pdfIn PDF document text
    • https://beb587af-1766-4a1c-893d-8c04a9882fa7.filesusr.com/ugd/f3bec4_f217c3da40d640eaad2c9034f062f693.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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 5360 bytes
SHA-256: bb8d688da10b4ddcb6f63d2161c1fe87da415aed875226cc027357bc049473cc
font_01_sfnt_off000101f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 10532 bytes
SHA-256: b790382b3fda4c0b2eac692f9b838fdc2f8720bdb3134945d7365c6fbece46a5