Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3e644df7fde3c2…

MALICIOUS

PDF

79.7 KB Created: 2021-03-22 21:01:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 25bf064def8c6a9a44e40d7376a9356e SHA-1: 6d59bcbf415b38d6242af2fa00dc439eff75d674 SHA-256: bd3e644df7fde3c256f50b66cc5d0c77b74b84ff77ad0132d39572dfc13d495f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for SEO manipulation or phishing. The primary malicious URL identified is https://botokaw.ru/award?keyword=excipiente+definicion+pdf, which likely serves as a gateway to malicious content or further infection vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://botokaw.ru/award?keyword=excipiente+definicion+pdf PDF link annotation
    • https://rupibofog.weebly.com/uploads/1/3/1/6/131607232/gogofiga-ruxug-lojazowub-dumubok.pdfIn PDF document text
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/boxifatogek.pdfIn PDF document text
    • https://cdn.sqhk.co/rafujajek/jfgcoo9/zizobewujutewalujum.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzetuzame/ADjbhcw/gajiranorokuvexi.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/AljjMdk/300_gallon_fish_tank_for_sale_used.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/eCPqxzP/vlc_for_android_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/4icb1mX/98307124622.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_fd07e0dce18247319b5a521d2ea3320d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8637c4b5-5493-43f0-a1c4-d5e64c9c9f2b/which_microwave_is_best_convection_or_grill.pdfIn PDF document text
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_f9a269846a3b465494027733b4ad034d.pdf?index=trueIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_0dbaa08615f74073ab364fa6c9ac241a.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_6080659aa6a6403294cdf98577da4f5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ee429da-7aa0-403c-9814-37eb0fdc1a4d/stanley_450_amp_jump_starter_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fada511a-f15f-4403-aff3-a06cbbb448ff/hunter_x-core_sprinkler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d142b3d7-b0d6-474f-9df1-8503f84419c4/how_to_apply_lubricant_to_elliptical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c1cfe9e-a9f0-4a46-b5d2-2303385c872c/100_startups_to_watch_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b90f45-bae2-4b40-b73c-772425c09a94/what_is_information_retrieval_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d9ec55-7adb-4d2d-b049-474250735dff/anne_bradstreet_to_my_dear_and_loving_husband_sparknotes.pdfIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_b8969519df3a4086ab2edc7ec8357324.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d57d31ad-b99d-4507-9fa9-ec6254142423/true_colors_assessment_results.pdfIn PDF document text
    • https://18cceff7-6d50-42ec-9d85-67184b61345e.filesusr.com/ugd/8c2e83_95fafeeb0b2245399d1d25283612ca81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/791dcb50-d990-4d66-a027-5c60a76df107/eiki_projector_lamp_reset.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_75ed1776c3ee4b4cbfe344ba97502f15.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_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 4656 bytes
SHA-256: 9726a38dea1797954678bbc60407e417cce6cea157f472315844114218f1f012
font_01_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 11700 bytes
SHA-256: 26d221777d3cb36a263c11b29cbd5160e31a87d0274380631a43b7b2469da7fb