Malicious PDF — malware analysis report

Static analysis result for SHA-256 8615ab3619999a21…

MALICIOUS

PDF

73.5 KB Created: 2021-02-25 13:56:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e1517b1b1ff6e5eeff947a642577dd9b SHA-1: c65f79f4f2b52d276bf325ded8246c8685e4dc15 SHA-256: 8615ab3619999a21af9cbc2f8c8cffdc197f11270256a967ca250edd1a4f2134
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of numerous links, including those on disposable hosting and disguised with search-like terms, suggests a phishing or scam campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=how+many+words+should+a+19+mo+old+say In PDF document text
    • http://ranking-se.com/sadixobegexavekipkm804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_60159659bac75.pdfIn PDF document text
    • https://cdn.sqhk.co/fetogivaw/jgj1Wge/2134771289.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/ariiftq/best_world_history_books_for_middle_school.pdfIn PDF document text
    • http://flowerport.store/ricetta_caponata_siciliana_di_melanzane2g0o0.pdfIn PDF document text
    • http://mostovaya.pro/54024375280gsv95.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/tujuzera.pdfIn PDF document text
    • http://outputqwvk.space/the_handmaid_s_tale_chapter_summary3ish1.pdfIn PDF document text
    • https://funotagikaxu.weebly.com/uploads/1/3/1/8/131857914/nuwisekuku_lemeg.pdfIn PDF document text
    • http://tipopajokoti.iblogger.org/fadadamorolubafujugob.pdfIn PDF document text
    • http://shop-you.xyz/36884356506g10qx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://getorisatenazu.rf.gd/black_and_decker_toaster_oven_digital.pdfIn PDF document text
    • http://vidabovon.epizy.com/how_to_program_a_intermatic_light_timer.pdfIn PDF document text
    • http://bejutamukedus.epizy.com/assistir_globo_reporter_ao_vivo_pela_internet.pdfIn PDF document text
    • http://buxusemi.epizy.com/56570716462.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_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 5428 bytes
SHA-256: 52e36f4bff11db43ed216865ab37343de476bd30b02ec99b38d51e9af695a42e
font_01_sfnt_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 10016 bytes
SHA-256: 91ae9e8b28d9710909d98f2ee3efe716f7cdcffeddd28de397c9a68c5395aeb3

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