Malicious PDF — malware analysis report

Static analysis result for SHA-256 490f29027f374cea…

MALICIOUS

PDF

83.1 KB Created: 2021-03-16 08:58:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 76320b5f6f0a689648d77f5dc70d04b5 SHA-1: 49e67e2a44188df226abb07c3c9eb06030a92f25 SHA-256: 490f29027f374cea2e1471c60a3297594a1f74daaf6ac07e7d23e2790df551f1
134 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, appears to be a lure for a free dictionary download, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=mandarin+english+dictionary+free+download+pdf PDF link annotation
    • http://jipetabonitu.mywebcommunity.org/curso_completo_de_apicultura_george_layens_gratis.pdfIn PDF document text
    • http://hisgohar.site/understanding_nutrition_14th_editiontneun.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/75505687513.pdfIn PDF document text
    • http://pililiriniru.mypressonline.com/wonders_of_the_world_book.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/KVEgh5u/desisomewuruliken.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/gidKmij/island_wars_2_full_version_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lamifiriluz/3icgehb/adding_unlike_fractions_worksheet_for_grade_4.pdfIn PDF document text
    • http://vashobereg.com/diccionario_castellano_ingles_google51hne.pdfIn PDF document text
    • https://cdn.sqhk.co/sejukuxa/zghwpgf/xofidenejadogukategitep.pdfIn PDF document text
    • http://erse.xyz/227083873896c0zv.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/sikuva/how_to_change_one_touch_needle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c3e256-4824-4d1a-8c80-7220744354c6/is_dark_souls_remastered_switch_worth_it.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/78590091868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dabebd0-b856-44e1-a2a3-078f0461b7b5/xapetexojudiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/25210803877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e32f4db-0c52-40a9-825f-1250a16a92c9/bokitisepagikebofi.pdfIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/lion_king_food_chain_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/sukejilibesaxagubixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28fc0233-cd12-4edf-8e91-5a35878f3064/dedem.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/android_10_poco_f1.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_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 9332 bytes
SHA-256: 9bd079f941f333db7af6378a3e98105daf111e708d62cf2bde82c386c8153e57
font_01_sfnt_off000100f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F8 5616 bytes
SHA-256: 8fd9a74c096c1e730443f87ed1623613b8746644fa66d2cf4dfffb7be5e4b411
font_02_sfnt_off00011438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 13084 bytes
SHA-256: 1ae76f5f1c1290700e441136bacf7d170aa84472a555fa14c60875985d59bb3a

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