Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc84f8f2591afcae…

MALICIOUS

PDF

85.2 KB Created: 2021-03-10 16:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c116e0b687577d86bc9d4862fab800e SHA-1: d03fc432b8059e852ee067f2cf0ab74e39f06541 SHA-256: bc84f8f2591afcae835149b88984e0b8708339b3a8f4ef2eaa8b76d0598a7ae7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan variant. It contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results or direct users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics indicate a strong intent to redirect users to external resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=applied+strength+of+materials+5th+edition+pdf
    • http://kasyanbeauty.com/10_x_10_grid_papert2678.pdf
    • https://cdn-cms.f-static.net/uploads/4455196/normal_5fd6697e5df8b.pdf
    • http://cashbackmoney.info/66163251529zjfcp.pdf
    • https://cdn-cms.f-static.net/uploads/4385436/normal_5fe84607d7882.pdf
    • https://cdn-cms.f-static.net/uploads/4406789/normal_603fcc6894820.pdf
    • https://static.s123-cdn-static.com/uploads/4371536/normal_5ffcf7806b1e9.pdf
    • https://cdn-cms.f-static.net/uploads/4416304/normal_604370a189c8f.pdf
    • https://cdn-cms.f-static.net/uploads/4459467/normal_604677ccd4944.pdf
    • https://cdn-cms.f-static.net/uploads/4490128/normal_6037b09811e07.pdf
    • https://static.s123-cdn-static.com/uploads/4422382/normal_6008ff34a88fc.pdf
    • https://cdn-cms.f-static.net/uploads/4402486/normal_6030cb63323ca.pdf
    • http://it50off.pro/financial_accounting_harrison_10th_editionmjjlo.pdf
    • http://woodbonus.net/2294645530ijmzk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vulekagezefodek.rf.gd/2448114983.pdf
    • http://xegewir.epizy.com/akele_tanha_jiya_ringtone.pdf
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_1aa755b64a87491eb404b88f725e6806.pdf?index=true
    • https://uploads.strikinglycdn.com/files/883fe255-2e14-420b-9ed1-32f45487364d/mobekipowelududimam.pdf
    • http://zasegusof.epizy.com/obusforme_backrest_support.pdf
    • http://bevunogigofijag.rf.gd/medicinal_plants_images_and_information.pdf
    • https://uploads.strikinglycdn.com/files/973d9dd7-1f97-40b1-9da2-f3de2206ccee/porter_cable_biscuit_joiner_556.pdf
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_bcb49bf4d11c4c18b6715fd7abb30ae3.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_off0000f123.bin
64803e70a7e85d746be9c0b8a60d6b25a28646a61ae8dcdee892a73f310869f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 5568 bytes
font_01_sfnt_off000103e8.bin
fd547a83c5e546af42cdec7267d43c4292cab6ab734ea9e5ade9a6bf67d635dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 14372 bytes
font_02_sfnt_off00013184.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13184 16204 bytes

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