Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc27bc179c06aa83…

MALICIOUS

PDF

83.4 KB Created: 2021-03-23 23:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7b4d35c44c5d7521cf79da8cfb39fe54 SHA-1: c5ed7ae56df68db14e1550ace15e758798c990a1 SHA-256: bc27bc179c06aa83cea6feb5949f5c90c472bdfa7a88e39dfc7d4976af5d8b4e
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 0.9994

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://jottigo.ru/123?utm_term=ccsk+certification+study+guide+pdf PDF link annotation
    • http://lagujegivupani.22web.org/wemegonimomagiji.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/hfmcBdQ/bollywood_mashup_songs_free_mp3_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468571/normal_60354c67a6551.pdfIn PDF document text
    • https://suzikotelun.weebly.com/uploads/1/3/4/5/134529630/cd71e1.pdfIn PDF document text
    • http://biomanix.best/nosaxajutawuwidile36s1h.pdfIn PDF document text
    • http://groby-ritual.online/45211830025tiqz3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_6015633fde1a1.pdfIn PDF document text
    • https://jofanota.weebly.com/uploads/1/3/2/3/132302765/revewanemasari-mokurup-busuranol.pdfIn PDF document text
    • https://volovumonanegom.weebly.com/uploads/1/3/5/9/135967081/zoluzajakul.pdfIn PDF document text
    • http://duwefazef.22web.org/bob_revolution_flex_2.0_jogging_stroller_lunar.pdfIn PDF document text
    • https://dizubegunusu.weebly.com/uploads/1/3/4/8/134889053/8019045.pdfIn PDF document text
    • http://wewedaz.iblogger.org/free_professional_resume_templates_for_word.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/dg4UigJ/crossfire_series_book_2.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/dynamic_stretching_routine_best_full_body_warm_upzcyn6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452386/normal_602dcf16919b3.pdfIn PDF document text
    • https://dukilukisa.weebly.com/uploads/1/3/1/0/131070258/6206081.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lizaduguxo.epizy.com/dengue_hemorrhagic_fever_who_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c65231ec-8fb2-4539-b52b-8715dd397fd0/pazarenolisabufoji.pdfIn PDF document text
    • http://riramemixezu.epizy.com/miduvajidewipugigexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/594f3de6-572c-459e-9e7a-6e9745a13b0b/why_is_pain_bad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0da9c8-a8f7-4fb5-bc7a-f54f8e931e87/what_is_the_importance_of_persuasive_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0940db32-5137-4ee6-a32a-71c425f6973d/59156617236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d40f71-2457-41f4-8d9f-d6ed46d6e0b4/pulavezasipukubenujet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 5360 bytes
SHA-256: 3b9f6eb2d53f95dc2f19689120b89699c060f9c1f079c22f08c3099ce1c9a254
font_01_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 10972 bytes
SHA-256: 3d040633720b3d17ca40547108f9a17201250866e07d330b14f6345cf69140d7

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