Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed1a634528d8997…

MALICIOUS

PDF

72.9 KB Created: 2021-03-03 07:27:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ebbc2cb27a0c577f730ad16deb5f315 SHA-1: 1cca9dceefacbbc89682c7bbd3de90c0633e50b6 SHA-256: 5ed1a634528d899784f8aadfae2758bb27ac782a91847fab2382a18506cf7d6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=brittani+louise+taylor+book+pdf PDF link annotation
    • https://cdn.sqhk.co/tabuguran/BJhajii/98339741222.pdfIn PDF document text
    • https://cdn.sqhk.co/kanemili/ibe49hf/sling_bag_tennis_europe.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/gi35j5p/91664016879.pdfIn PDF document text
    • https://cdn.sqhk.co/boguzivipel/mie01gi/tomesekirixi.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/jeQjfrr/1581007926.pdfIn PDF document text
    • https://cdn.sqhk.co/mubasetopagu/14ghbhi/prismic_pinball_free_download.pdfIn PDF document text
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/tavonabafuman_potakanaf_ravekuroxi.pdfIn PDF document text
    • https://soletobapikod.weebly.com/uploads/1/3/4/5/134582957/8fc81f2149a6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tavejetenugaku.epizy.com/an_anemometer_measures_answer._com.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/toxozuzafereginedesun.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/assassins_creed_2_java_for_android.pdfIn PDF document text
    • http://warurodezum.epizy.com/nukuvokidelot.pdfIn PDF document text
    • http://zarevamemamafo.rf.gd/black_and_decker_7_1_2_inch_power_band_saw.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03E 5392 bytes
SHA-256: a15fc6de828cecabce0b4a062c67b4b80ecbe0be50644f44e55cbb1ba4218d97
font_01_sfnt_off0000f2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 10404 bytes
SHA-256: 429c87edc95905e707941e08019a70b9761065445fc67695b5a4d36a56edc745

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