Malicious PDF — malware analysis report

Static analysis result for SHA-256 379a3481353d58c8…

MALICIOUS

PDF

74.8 KB Created: 2021-05-18 04:40:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ca26df4bccbd89bdbbeea04a5dea1f2c SHA-1: fbb5a537a342f810e3ae790c9cf33048b348ebdf SHA-256: 379a3481353d58c89b7c134674fe62f1d8595f6dda9d1b4d8ba1473b37caa132
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF_SEO_LINK_FARM heuristic, pointing to various URLs. One of these URLs, https://xezojetit.ru/strik?utm_term=super+mechs+mod+apk+unlimited+token+2020, is flagged as suspicious and likely serves as a distribution point for malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=super+mechs+mod+apk+unlimited+token+2020 PDF link annotation
    • https://xunumiselodaz.weebly.com/uploads/1/3/0/7/130775676/wasomokaso.pdfIn PDF document text
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/5f529ac21.pdfIn PDF document text
    • https://zipapujemufosir.weebly.com/uploads/1/3/5/3/135392102/kuleraza.pdfIn PDF document text
    • https://vibusipapomokij.weebly.com/uploads/1/3/2/6/132682711/1784968.pdfIn PDF document text
    • https://sebinegovana.weebly.com/uploads/1/3/4/0/134095930/0cf002f9042a1.pdfIn PDF document text
    • https://zixeveke.weebly.com/uploads/1/3/4/7/134702539/c3821075429f476.pdfIn PDF document text
    • https://xeneniwavufew.weebly.com/uploads/1/3/2/8/132814439/9862439.pdfIn PDF document text
    • https://gumulopeviw.weebly.com/uploads/1/3/5/3/135348062/duzapobegosa.pdfIn PDF document text
    • https://wilibupa.weebly.com/uploads/1/3/2/6/132681560/nokamolezevutawene.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/anarchy_online_patch.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/marketing_mix_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/why_is_my_orbit_sprinkler_valve_leaking.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/gwangju_tourism_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/tasami.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/acrylic_sheet_for_sale_in_manila.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/50251080528.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/vuzodigen.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/54704983656.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/mejamale.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/volararoxetexasexumizuda.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_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 5756 bytes
SHA-256: e634d807107558afadf519c5a60ea52d790b2026f1cd4eb0dd8df5512d4a14c7
font_01_sfnt_off0000f83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 11124 bytes
SHA-256: da88fdd3d6f3b65bd91c76ae13fc5126d9859e5acddd57d6550a2f8e420a787c

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