Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b41c88d7666efa3…

MALICIOUS

PDF

94.0 KB Created: 2021-03-22 19:54:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5295deedac9b3e243e9fc34d7f3a9058 SHA-1: 5c229a9e29dd7a76f2da0e3a9c6950fa6a9e422d SHA-256: 8b41c88d7666efa3bf0634904534876540e965c48561ad40b0fd646be6df41bf
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 0.9997

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://seumenha.ru/wix?keyword=investigating+sound+waves+lab+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475992/normal_6035224c28d73.pdfIn PDF document text
    • http://vemasujananexu.22web.org/pulgadas_a_cm_formula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486981/normal_600508a0ee114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_6039dc101b902.pdfIn PDF document text
    • http://nemeloru.66ghz.com/word_formation_processes_worksheets.pdfIn PDF document text
    • http://spacexfoundation.net/visual_studio_2015_professional_license_keyppayp.pdfIn PDF document text
    • http://form-copyrightservices.com/texas_am_dining_meal_plans8m16j.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://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_6af5b5b6ded74bb4a8beb171d0b30188.pdf?index=trueIn PDF document text
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_439841c283514b1088e8c4174a197e06.pdf?index=trueIn PDF document text
    • http://rukukuwozar.epizy.com/kangna_remix_song.pdfIn PDF document text
    • http://fivasire.rf.gd/chrysler_town_and_country_2006_manual.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_5a9e8bd4b18a45b5a64663770a05d12b.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_6e704943f22e44f7b7316dc388c36b8f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/979ea8a2-51ad-4c6b-8740-a05b6d3aa588/plantronics_voyager_520_earpiece_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/what_is_the_setting_of_psiphon_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1307eea-441a-45f6-82e4-8f004f5ab60e/44060811934.pdfIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_fca511db025547e69274077e181b922f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kubafezin/ruwuje.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/9179615872.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/thug_life_apk_free.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_off000123ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 5104 bytes
SHA-256: d8abda2f4ea892f4ac235be7460f2f292618c8527797536b694e25817a88ffd0
font_01_sfnt_off00013540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13540 10956 bytes
SHA-256: e28b85f3bc09bfedb236df89ce5b6b958ef6d1b3b6913f82046b4f3ade1d1c4f
font_02_sfnt_off00015ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB1 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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