Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0937f0a8baf9a2…

MALICIOUS

PDF

88.7 KB Created: 2021-04-04 07:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4e37aa2f41540c5170f29e4b414896e0 SHA-1: e3d4765ea191b3ce481ea10038a74aa12499154b SHA-256: 1d0937f0a8baf9a2e461c983cc4ea99dddedebb20ac92a17b96a724b5d00908b
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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://mezovuduw.ru/wix?keyword=greek+alphabet+worksheet+pdf PDF link annotation
    • http://aires.fun/diesel_mens_belt_size_guideann2d.pdfIn PDF document text
    • http://samo-katim.ru/egyptian_mythology_quiz_questions_and_answers6fld7.pdfIn PDF document text
    • https://jevejokanidepit.weebly.com/uploads/1/3/0/9/130969277/5522767.pdfIn PDF document text
    • http://getfreecreditreport.info/what_are_the_qualities_of_a_christian_youthle97v.pdfIn PDF document text
    • http://top-odejda.com/libawixuvusuwuxuvofad5znv.pdfIn PDF document text
    • http://itali-big.space/find_out_zombie_hospital_walkthroughz8apq.pdfIn PDF document text
    • http://setofexperience.site/kugarezibzp4b2.pdfIn PDF document text
    • https://zujujogonawanuk.weebly.com/uploads/1/3/4/8/134879196/goxewiv-monorijapep-loput-kiwowemigunupu.pdfIn PDF document text
    • http://pochta-24.cc/jofupajowali3opw6.pdfIn PDF document text
    • https://bazulerijodinib.weebly.com/uploads/1/3/1/8/131856415/mowufak_bopelar.pdfIn PDF document text
    • http://cashfree.store/79682611884078k7.pdfIn PDF document text
    • http://tugrull.com/why_is_man_in_the_high_castle_ending5apaf.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/aa7e2565-9b03-4e21-9fcd-eb8132eb4454/practice_makes_perfect_french_reading_and_comprehension.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b957ea0-50f0-43cd-bf8e-16216e29288c/162734080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aac3d13-a2fa-420c-9c82-36bf6dbf5c19/evaluating_arguments_worksheet_declaration_of_independence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb37311e-e9b8-426c-b951-6057b7ebe8b9/does_the_whirlpool_cabrio_washer_have_a_lint_trap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c27f65e9-f20e-4297-b277-d45e11e05323/brother_hl-2270dw_wireless_setup_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb74f2c4-9375-4873-8fdb-f126a1d17ca9/how_to_install_britax_forward_facing.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/wadamunobasoruxufefebud.pdfIn PDF document text
    • http://birofasadonu.epizy.com/suxibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02fb0ff5-a5b3-49ab-8db9-12ebe2ece3ec/50240799876.pdfIn PDF document text
    • http://zijevaru.rf.gd/13926648875.pdfIn PDF document text
    • http://wefukuw.epizy.com/29930688371.pdfIn PDF document text
    • http://misopipe.rf.gd/engagement_invitation_template.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_off00010da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 5088 bytes
SHA-256: 5a75fb857b0da998d9d5bc71cb3aa9df622db4e169fb7d29027c0c35c8fcd16b
font_01_sfnt_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 11304 bytes
SHA-256: f71e02758b46b088e567ec884bd9daaa462548334345dc3566fa61275f529ed6
font_02_sfnt_off0001458e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71