Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0501f66817a132…

MALICIOUS

PDF

72.2 KB Created: 2021-03-12 09:24:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7d316c8fc2ea4cedafffd619b04396f8 SHA-1: 205184ce1bcfec0295b29f43bbcc5b51460f8fff SHA-256: aa0501f66817a1320b0483c4a1b818cc815bedcd489dffd3f1b3b82c93304782
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a remote-support lure. 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 0.9995

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://pelibifir.ru/123?utm_term=medical+dictionary+for+pc++free+offline PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382965/normal_5fdc412c9976b.pdfIn PDF document text
    • http://uspeh.icu/how_to_draw_really_cute_animals_bookyo77o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446259/normal_601f94cd3291b.pdfIn PDF document text
    • http://mexicotop3.xyz/wheres_waldo_3000_piece_puzzle_pictureucjg0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456686/normal_602ceab5915b7.pdfIn PDF document text
    • http://swiss-gear.store/sennheiser_ew_100_g3_no_sound7l11w.pdfIn PDF document text
    • http://verifiedbadges-form.com/the_walking_dead_volume_261k4j1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469837/normal_6008058a6c129.pdfIn PDF document text
    • http://opt05.ru/65293491878xst6h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387566/normal_604675f4ee6be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459470/normal_60239d5c829db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453720/normal_600d45d4c2623.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460241/normal_5fe53b58826af.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/jivuxo/wiwinekokag.pdfIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_98dedba3801848828a769447e7452f84.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/tojuzomiliwo.pdfIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_fba1cb38230f46a6ae877d94ed47cb51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fasudikek/anydesk_windows_10_64_bit.pdfIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_ec59973cd4374595acdc642ff9e47d61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/guzewu.pdfIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_c3d277a59b2247a9a14be6f6aa750fd9.pdf?index=trueIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_05e4ade0606e4807bf6a16cc101cb7af.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_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 5080 bytes
SHA-256: 185b193bd7251b9bdfa99a2f034f346c61ba089bc24602000ecd51683012a552
font_01_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 10472 bytes
SHA-256: 28a0c109ae7eb4392ce3a3ad55e16db365265b6fe474d1d2a0c9e564863d9996

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