Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a76d9307d6cd618…

MALICIOUS

PDF

77.5 KB Created: 2021-03-14 18:12:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb6c677268bd82ebddae88d6b7d554b5 SHA-1: 2607e31e8215bc2693b380cab81f4c395aa2bf16 SHA-256: 4a76d9307d6cd6181253dd7618f7f47dacffff2790b8262e79087e26e5311a82
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on link farm domains, suggesting a phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/123?utm_term=loss+of+biodiversity+causes+and+effects+pdf
    • https://cdn.sqhk.co/gawagunikuw/Z1TcShf/jidusugageravulinutux.pdf
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/7252277.pdf
    • https://pudasebedizut.weebly.com/uploads/1/3/4/5/134587980/ferop.pdf
    • https://rubajamepufukav.weebly.com/uploads/1/3/4/4/134432722/6f7e93.pdf
    • https://cdn.sqhk.co/fisoxinizo/2Miihcj/learn_russian_beginner.pdf
    • https://furamakivagoj.weebly.com/uploads/1/3/0/8/130814247/b6b59e930.pdf
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/70afd2f.pdf
    • https://cdn.sqhk.co/tuzevawu/fhbejaO/xagusinoxabok.pdf
    • http://muwazosibavefed.iblogger.org/chloroform_definition_for_kid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/roxawo/51107400786.pdf
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_35fd6e667b6c4a05a8c19fa6aac4d041.pdf?index=true
    • https://s3.amazonaws.com/rojalexipokadaz/xuvogivawanoku.pdf
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_597e2b78d583478dabdb35feb3be0a89.pdf?index=true
    • http://sikadakomog.epizy.com/muwofex.pdf
    • http://jovelabomitom.epizy.com/rotepofuvulazuga.pdf
    • http://xopozajuve.epizy.com/1999_dodge_dakota_repair_manual.pdf
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_b29061ff369143f18f78ef7d803687f3.pdf?index=true
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_72ab0cdf31c249da9791178b19fdaf7b.pdf?index=true
    • http://zuxamivim.epizy.com/apocalypto_2_hd_movie_in_tamil.pdf
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_df3b6d13dc374d5d931ccd9539b8ef91.pdf?index=true
    • https://s3.amazonaws.com/nojemi/printable_airmail_envelope_template.pdf
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_9cb49cc2d09349878916fbf0ee910e17.pdf?index=true
    • https://c9977776-9e37-4432-9eae-e541147807da.filesusr.com/ugd/bb6cc6_97b173fd83c54802a028fcea2e0596a4.pdf?index=true
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_d94ca1f95a514d14a54ab41d8f6d5b2b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f261.bin
1579a9a5d166e0a3fb9ece14853ae9987479fea63c894cabc5beadba54fe162a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 5360 bytes
font_01_sfnt_off000104bb.bin
f1df677c5caa5d50295cc5a75f6afdaa7bdc6af86a734770910882877756aeba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 10348 bytes

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