Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32f6632a1717cec…

MALICIOUS

PDF

88.4 KB Created: 2021-04-05 09:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 52c81225084dbee9862999ff9e75c54a SHA-1: 9d427318db984db6153563a565350965b3adde93 SHA-256: d32f6632a1717cec2177f94ff823aacd4a77bf8d3f95637e1c9d7cb13ebdc34d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9993

Heuristics 5

  • 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 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/wix?keyword=algebra+6th+grade+quiz PDF link annotation
    • https://cdn.sqhk.co/viwitukaz/2iiXXjc/79921133505.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424405/normal_5fe9fdc628bb1.pdfIn PDF document text
    • http://unreguezff.rest/66579870750xaig4.pdfIn PDF document text
    • http://aicberg.net/lets_talk_in_english_conversation_182qety5.pdfIn PDF document text
    • https://cdn.sqhk.co/nabotogemobe/hjihwgc/strategy_meaning_in_english_oxford.pdfIn PDF document text
    • http://lenusabipowezo.getenjoyment.net/33614896145.pdfIn PDF document text
    • http://criticcxck.space/lee_kuan_yew_from_third_world_to_first_the_singapore_storycdjef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411228/normal_6039e948b44a9.pdfIn PDF document text
    • https://cdn.sqhk.co/zakolemafemo/gjhagfe/lookout_tower_coloring_page.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/17692648961.pdfIn PDF document text
    • http://pazefezos.mywebcommunity.org/55370151168.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvajuvewuj/gFhbzdv/xumizopasevipupapini.pdfIn PDF document text
    • http://lajafago.medianewsonline.com/lupek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_604fe99c8ccc9.pdfIn PDF document text
    • https://cdn.sqhk.co/tekunipifob/g1Spjba/circle_colored_pencil_art_projects.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetijesi/dK05xqk/hidden_survivor_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426422/normal_5ff7c9966b32f.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/egjijhg/learn_android_development_book.pdfIn PDF document text
    • http://pirewarekow.mywebcommunity.org/vunirilese.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 5368 bytes
SHA-256: 0b60f783685d35752350a8da09a02d6e890a7395a90eb30850f53d7407feefe6
font_02_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 2116 bytes
SHA-256: 49f1c345582212729590e0456707ca92d3838aef8cba26fbcaa28f8c5b0a0640
font_03_sfnt_off00011972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11972 10580 bytes
SHA-256: fd93077ad93ef21d3c9ed16d287f87dbbaa29175178861ff27d30e24452203ac
font_04_sfnt_off00013de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE9 16148 bytes
SHA-256: dbe1f6873dfbc63a557840fa26764ed1e24daf10180a919a5f50e881975b6f06

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