Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c16234d578e1229…

MALICIOUS

PDF

71.4 KB Created: 2021-03-19 14:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0ca988dc0a2736b83831f780ac3287e SHA-1: cde71ee3267ff691a963fe2288ec27c671518eb4 SHA-256: 5c16234d578e1229dda5d3671e611dbb0801263ccef04aaf05f1cd31195d6c91
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 pointing to PDF files, suggesting a link farm or a method to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

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://golowaki.ru/123?utm_term=a+level+computer+science+study+guide
    • https://cdn.sqhk.co/wafasojudo/naf8Mh0/asymmetric_information_market_theory.pdf
    • https://wosutazewaxutu.weebly.com/uploads/1/3/0/7/130775331/6427332.pdf
    • https://cdn.sqhk.co/tibakekavero/iqFGidm/danadolin.pdf
    • http://pusedoropeseb.66ghz.com/break_even_analysis_template_with_graph.pdf
    • http://mowewuwopirot.iblogger.org/13561536518.pdf
    • https://finonofegikagaf.weebly.com/uploads/1/3/4/0/134041572/wetixiwiruvivaramef.pdf
    • https://cdn.sqhk.co/kifuzopeko/j2hhvTJ/dynamo_sensitivity_for_pubg_mobile_emulator.pdf
    • https://cdn.sqhk.co/beratinuga/ifjijdA/fuforokufojudusajitugup.pdf
    • https://xepovilebifupu.weebly.com/uploads/1/3/6/0/136086158/2316325.pdf
    • https://tujobofawoti.weebly.com/uploads/1/3/2/6/132695409/9336057.pdf
    • https://cdn.sqhk.co/tolononof/fghjjjd/avakin_3d_avatar_creator_mod_android.pdf
    • https://poperetaro.weebly.com/uploads/1/3/4/8/134893078/nevofojupa_sarokodupufa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/44763bde-5682-47c6-b41a-38ab3c7e5b30/ninovosuzovexu.pdf
    • https://uploads.strikinglycdn.com/files/99efdb01-6b52-4354-ae90-6df29706f45b/libros_de_harry_potter_en_orden_para_leer.pdf
    • https://uploads.strikinglycdn.com/files/80249f8b-d473-4778-9193-299696871bdf/lukunitutibel.pdf
    • http://likalesiwala.epizy.com/bully_mod_rexdl.pdf
    • http://bapijutuzum.epizy.com/kidukapizi.pdf
    • http://refazak.epizy.com/gofosusibabiz.pdf
    • http://ruwijadigov.rf.gd/kovubegu.pdf
    • https://uploads.strikinglycdn.com/files/e6f216f5-daa6-4bb8-acb6-2e4cc5e8f54e/98479539096.pdf
    • https://uploads.strikinglycdn.com/files/8d80e94c-e4f8-4ad3-bed1-36dfab42762a/87739739680.pdf
    • https://uploads.strikinglycdn.com/files/af07d4ca-4ec2-41a6-b942-862b7353312c/46803107150.pdf
    • https://uploads.strikinglycdn.com/files/c04e0aa2-641b-4c03-81b6-709a705306b2/diritifugumikariromumevod.pdf
    • http://powulizadej.epizy.com/63160863505.pdf
    • 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_off0000d84d.bin
42eac1151e551cb807a22478b267f8e4a97b3d44ca40167895023412e0156a0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 5336 bytes
font_01_sfnt_off0000ea6f.bin
f8f83fcb09a191dc5f55f22ffc29077abddb92ecd2349cedaa74f410557ba8a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6F 10640 bytes

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