Malicious PDF — malware analysis report

Static analysis result for SHA-256 be737f5b72b2d0a0…

MALICIOUS

PDF

99.0 KB Created: 2021-05-07 08:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a182b335ff34f569a6559d916c7ca091 SHA-1: 467032e0a099d55ddc2eb2a4404860b5f2ea2c6e SHA-256: be737f5b72b2d0a063e05cbb2c7d11cd815799e5f70aac0d238ec75649313b8f
186 Risk Score

Malware Insights

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

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 0.9990

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/strik?utm_term=engineers+black+book+amazon PDF link annotation
    • http://itravelgr.com/advanced_engineering_mathematics_erwin_kreyszig_sladerrgb3r.pdfIn PDF document text
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/kevamowuguruge.pdfIn PDF document text
    • https://diwimiwiwomenen.weebly.com/uploads/1/3/0/9/130969795/2442830.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/iagdJgf/fun_things_to_do_around_philadelphia_this_weekend.pdfIn PDF document text
    • https://zoxipunawogedo.weebly.com/uploads/1/3/4/2/134235683/2a9f7f62.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/iAbwwGo/dragon_fighting_ancient_city_epic_battle_simulator_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/vosiwuli/GAvMhjz/certificate_of_origin_form_a1_format.pdfIn PDF document text
    • https://cdn.sqhk.co/wubukuxivupe/hdvirjj/bounce_news_app.pdfIn PDF document text
    • https://todilotifobaw.weebly.com/uploads/1/3/2/7/132712516/6982286.pdfIn PDF document text
    • https://tulopesonu.weebly.com/uploads/1/3/5/3/135318186/vatonagezoka.pdfIn PDF document text
    • https://cdn.sqhk.co/suxevevagova/ijxRhgl/gtr_car_simulator.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/lobedajowep0spd0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_ad3ae73e732a45a99ff86d3901d2d6e9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd2c535-afd3-4805-99eb-71610664e843/konazuzikimumov.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/when_an_elderly_parent_is_abusive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b049d134-6914-4a78-8763-c3573bf2949e/96951159729.pdfIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_d5dd842f56864abe8a5c3a0f648ea4d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9622a1e-a3ee-4445-9bdb-3dc90b3d3e74/how_to_write_a_poetry_analysis_essay_ap_lit.pdfIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_498d9c76968f4fd194853ae3b2e125f3.pdf?index=trueIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_fbdf754cf7ff440488657f5cda4ac020.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tevomenil/free_excel_2020_yearly_calendar_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c47401f9-ec18-4538-9fbf-0d9a11735d49/53288336761.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/wirisasidufunejadofekeve.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/can_t_connect_to_wifi_hotspot_android.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/heroes_of_olympus_books_free_download.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_off0001413b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413B 5332 bytes
SHA-256: b8f1dac78d9e58c942d9ab2e7f7b54c9e1514db08ac33071db34ffa4f599c01a
font_01_sfnt_off0001535b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1535B 12736 bytes
SHA-256: afb5498966821af8722d79b432f34ee52c05557566dcee2497982dc9e7a9b51c