Malicious PDF — malware analysis report

Static analysis result for SHA-256 c523e56cd5a33fc1…

MALICIOUS

PDF

77.5 KB Created: 2021-03-12 10:10:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e5e31a5df4488a7a0ddcf3b2cb357f49 SHA-1: 731ed0ad2d79dcee2503fc23e899994ee1eed151 SHA-256: c523e56cd5a33fc18fdb22b595c6f01528c38283d2c249a93cdebccda57b54bd
156 Risk Score

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 0.9996

Heuristics 5

  • 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.
  • 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://dugedepap.ru/wix?keyword=maplesaga+mage+training+guide PDF link annotation
    • https://diruwogedow.weebly.com/uploads/1/3/1/3/131382439/c51feb0ce5.pdfIn PDF document text
    • https://remejatezikame.weebly.com/uploads/1/3/1/0/131070309/xigoxumav-tabovezediki-pelujuz-lezoneke.pdfIn PDF document text
    • http://maxuruz.22web.org/levijadutefuvobunopif.pdfIn PDF document text
    • http://sotinifox.22web.org/calendario_escolar_oficial_2019_y_2020_sep.pdfIn PDF document text
    • https://puziwurawube.weebly.com/uploads/1/3/1/8/131871408/fedate-dororibi.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/kelejafobul.pdfIn PDF document text
    • https://xitarowax.weebly.com/uploads/1/3/2/6/132681505/5b66886d9b028f3.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/nolema.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lawazujazigefon.epizy.com/33910238943.pdfIn PDF document text
    • http://repikigerudu.rf.gd/70757770647.pdfIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_ffc6541e4c2d4a5da3ca63e19a6b46d7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukutud/android_studio_windows_10_64.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/commerci_republic_quest_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/86350270625.pdfIn PDF document text
    • http://vepitejususas.atwebpages.com/unitypoint_clinic_des_moines.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/hp_p1606dn_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/the_maze_runner_2_2014_full_movie_in_hindi_download_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/ropetitisemewadele.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/christmas_dress_down_day_ideas.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/pomujafa.pdfIn PDF document text
    • https://95a83a18-022f-4aa5-9dc2-588eac4c5c4a.filesusr.com/ugd/ccb6ab_51a8183aa8104acabda46e6d06eaf3d7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 5056 bytes
SHA-256: 42cc25c171700ad5c47caa2ce42b38b056a7e2c935d3dd2019a3b0c956663f6c
font_01_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 10420 bytes
SHA-256: 35491fb437f7ff73e62f5f8d087591c094194034261c779c91911ab6e83ba5b5
font_02_sfnt_off00011aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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