Malicious PDF — malware analysis report

Static analysis result for SHA-256 54880cc085fc13af…

MALICIOUS

PDF

80.7 KB Created: 2021-03-10 13:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e547d586395683496f0e477150ae2676 SHA-1: 9000dde0c70136e076344c999b5c0de9e2a406dc SHA-256: 54880cc085fc13af21b19cdff845a798b5f5edd87e5bb136eaf0e9670b17e6dc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://nipisod.ru/wix?keyword=unblocked+games+run+3 PDF link annotation
    • https://cdn.sqhk.co/vufuvevu/MFijheA/introduction_tensile_test_lab_report.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/jfhdic6/19816215570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_60392eb12c60e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482191/normal_5ffb70ac9dae4.pdfIn PDF document text
    • http://alkim.xyz/elementary_and_advanced_mathematics_by_kiran_prakashan_in_hindi250wf.pdfIn PDF document text
    • https://cdn.sqhk.co/xijisejes/MzMhiii/steelseries_aerox_3_wireless_mouse.pdfIn PDF document text
    • http://djami.ru/do_doorbell_cameras_have_a_monthly_feeni8f6.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/jbibrFP/hearts_emoji_copy_and_paste.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/gczEjbR/classic_kong_for_dogs_small.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473053/normal_60241c9a0ae13.pdfIn PDF document text
    • http://fashion-deals.xyz/do_3ds_chargers_work_on_ds_lite5vqii.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetovukufo/TAV2ggR/vudusir.pdfIn PDF document text
    • http://funapuz.iblogger.org/best_graphics_android_games_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475859/normal_601ba7d2b3771.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lavuradisaxel.epizy.com/alloway_lake_fishing_report.pdfIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_17ffefb3418e4a029c5a97e787ee15fb.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_2dbbb84cc4f34e3698e53fe474c096ab.pdf?index=trueIn PDF document text
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_32281123d34e425c92c50ebe33a348ae.pdf?index=trueIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_1755a23c738848308b249f06ab5282fd.pdf?index=trueIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_168c50a615a742deb6a471497e4137ac.pdf?index=trueIn 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_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 5616 bytes
SHA-256: 5115999d03e5c308f0b116c86082f94b7c4c52b44a782f60d8b248e350370734
font_01_sfnt_off000104d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 15376 bytes
SHA-256: 19621003f14a43d4ef6f217d3257a9628b460620d5bb8bdedb81678ac7626758

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