Malicious PDF — malware analysis report

Static analysis result for SHA-256 93987ddfd5ee4181…

MALICIOUS

PDF

100.1 KB Created: 2021-02-23 17:55:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3d2b64d6b8076cf19a9a4823e6499464 SHA-1: 77768d62df803aa2e8cfd4c75f37b155f4d84a57 SHA-256: 93987ddfd5ee418189436657e7cd0b655294b8edad39c1249096e6e5491c1be6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm designed to redirect users to potentially harmful content, specifically mentioning 'auto mechanics books free download' as a lure. The PDF_SEO_LINK_FARM heuristic firing confirms this strategy, with numerous links pointing to PDF files hosted on various platforms.

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://seumenha.ru/strik?utm_term=auto+mechanics+books+free+download PDF link annotation
    • https://kodavagimiwebod.weebly.com/uploads/1/3/5/3/135346487/6290987.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/Tqgf5tH/download_videobuddy_on_pc.pdfIn PDF document text
    • https://gawopina.weebly.com/uploads/1/3/2/8/132814119/9102888.pdfIn PDF document text
    • https://lekaretuzej.weebly.com/uploads/1/3/0/7/130738752/7211204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_5fe9f1ba8c5b4.pdfIn PDF document text
    • https://kegipulavuraruz.weebly.com/uploads/1/3/1/1/131163865/tuzevoxupeg.pdfIn PDF document text
    • https://cdn.sqhk.co/wusosekame/Khi2Wua/world_soccer_league_all_teams_unlocked_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_5fd2889ad6f16.pdfIn PDF document text
    • https://suzixibaru.weebly.com/uploads/1/3/4/7/134709676/5279666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453889/normal_601749b2cf9a6.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/xokebore/lejulikoxefajuzin.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/20506822693.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/boulevard_of_broken_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/cisco_ipsec_vpn_client_android.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/bhagwan_ke_video_song.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_off00014aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA8 5548 bytes
SHA-256: 545ff883d8f57050dc8b322cc39e6216693011c040fe790b3848ed6310c4bf14
font_01_sfnt_off00015d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D6B 11108 bytes
SHA-256: 97dce01b2b1d65214f17da6872c6a860883e5f109853d04a190c799f1df26419

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