Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4e0941612230d6…

MALICIOUS

PDF

93.0 KB Created: 2021-03-24 20:37:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15d1826236e51a67c5bba589728fd159 SHA-1: de150e4e206cb6859b4699d34882a7ed92b2e82d SHA-256: 1f4e0941612230d6d791bb15b3c5f10dad62200d18661729e80d37092ffa0a4a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic indicate a pattern of directing users to external content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://zajinet.ru/wix?keyword=compaq+ipaq+pocket+pc+h3900+manual
    • https://wizudagusosok.weebly.com/uploads/1/3/5/3/135317744/8229124.pdf
    • http://demask.space/fogufawzhxem.pdf
    • https://jesepivop.weebly.com/uploads/1/3/1/4/131483445/lujovofegunar_juperiditaber.pdf
    • https://nobixerevogug.weebly.com/uploads/1/3/4/4/134481004/35618.pdf
    • https://mipikarekegimo.weebly.com/uploads/1/3/1/6/131606279/wurinovetul_kozowejevik_kugofemi.pdf
    • https://ganilujojaj.weebly.com/uploads/1/3/3/9/133999239/makakesukewi.pdf
    • https://befugusugub.weebly.com/uploads/1/3/2/6/132683140/navos.pdf
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/bokewebasififiri.pdf
    • https://cdn.sqhk.co/simikitivo/Khdxhht/pigeon_attacking_baby_pigeon.pdf
    • https://tefufujilidawa.weebly.com/uploads/1/3/4/5/134578337/602e1d.pdf
    • https://cdn.sqhk.co/rotuzuwibi/aheqjgo/65104834180.pdf
    • https://robugagemo.weebly.com/uploads/1/3/5/3/135304688/3777690.pdf
    • https://cdn.sqhk.co/menasimax/4jdibhd/49113001136.pdf
    • http://mavito.online/march_assist_app22mz4.pdf
    • http://regvoolkim.website/how_to_apply_diffusion_of_innovation_theorybdtqd.pdf
    • http://specialsale.info/bereket_enerji_yataan_i_bavuru_formui9eiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/77a862e1-e71b-4d29-86f9-e07ae45a47e8/20322633543.pdf
    • https://uploads.strikinglycdn.com/files/24ce4619-3c40-4605-9686-4c2d29771ae1/como_sacar_una_foto_panoramica.pdf
    • https://uploads.strikinglycdn.com/files/a0e6d9ae-1627-462a-aefd-74c0681c2b27/academic_writing_skills_cambridge.pdf
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_c8b3bb0df64940cfbbfee64250f958e5.pdf?index=true
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_df859ffc85d54c67a85e8aecdbb00a72.pdf?index=true
    • https://uploads.strikinglycdn.com/files/57da85b2-56fd-470d-9773-28f1674b892a/redejimuvutanewek.pdf
    • https://bed2d873-735b-46bb-a8a3-264d0455df4e.filesusr.com/ugd/03ede2_4235e7a9641e4036aaba940f49cb32af.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d3acf2af-54cd-4fd4-8ca9-2200d3db6442/toro_personal_pace_timemaster_223cc_manual-push_lawn_mower.pdf
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_03c1ce6314254d78a71f52c232338fa1.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011595.bin
aa524d41be3eaef9ff32380f74ae1fc4ff04116245054bce33c10b29e1becb90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11595 5456 bytes
font_01_sfnt_off00012803.bin
e82b1ee4b1d73c01a3a5be0a887e9e4ce4d21be66eb7d6433bedab65df611545		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12803 12144 bytes
font_02_sfnt_off0001501c.bin
dc866944490878871c34987d85f1b18747c88a2fb8ee5d7801f6bac7253423eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1501C 16364 bytes

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