Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf9cb70d004ddd7…

MALICIOUS

PDF

73.3 KB Created: 2021-03-17 06:10:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0a6c58021c41388f26fac52879e72d0b SHA-1: c3be914608a4863598edb114aada90f6cd954842 SHA-256: 5cf9cb70d004ddd7f197f71ddfa8dfb17ed427653fa3ffb0f275e96ce8e81407
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

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://xezojetit.ru/strik?utm_term=kaplan+mcat+practice+test+pack PDF link annotation
    • http://zufejexilovexik.22web.org/blob_url_format_azure.pdfIn PDF document text
    • https://penuwepilaxol.weebly.com/uploads/1/3/4/7/134756509/db6e1cb.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/gofopewatoze-gekodiwonur-mibojudekivawe.pdfIn PDF document text
    • http://gagefepinulivaf.iblogger.org/lost_tribe_of_the_sith_comic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463262/normal_60446c79527f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503617/normal_60216b78196e4.pdfIn PDF document text
    • http://tubudemawaxoki.iblogger.org/51051625149.pdfIn PDF document text
    • https://vanuludegevu.weebly.com/uploads/1/3/0/7/130776818/f834a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366957/normal_5ff98df6e49e4.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/5649fb84-5225-4477-8fea-a39dde207c2b/25720892846.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6351f2c-8047-4e3b-be7a-c50621f62391/bushel_with_ibex_motifs_animals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0ff2ddf-2b45-44f8-81f3-7fe4371c1fc7/ledetatilobur.pdfIn PDF document text
    • http://jekidosokun.epizy.com/colt_ford_song_answer_to_no_one.pdfIn PDF document text
    • http://webuguvafu.rf.gd/75428659489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d2a232a-1c4b-490b-b8c0-45802ac08011/how_do_rappers_get_into_the_music_industry.pdfIn PDF document text
    • http://nisinukodepafix.rf.gd/nora_roberts_trilogy_about_witches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0be0f62e-4c08-4ce7-a90b-3cc9e0016bd2/how_do_i_watch_netflix_on_dish_without_the_hopper.pdfIn PDF document text
    • http://gobiburitumeri.epizy.com/hollow_knight_voidheart_edition_guide.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_off0000e2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F3 5112 bytes
SHA-256: a6022a6f708f41c4548670c2dc61ad1d9a49c551aafd6cc20930b2de374b76d3
font_01_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 10556 bytes
SHA-256: abc9ee6593c7d07d241891a6502f61a5d16925fca5154fe17b8e582928d4516d

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