Malicious PDF — malware analysis report

Static analysis result for SHA-256 acafc279413616e2…

MALICIOUS

PDF

75.5 KB Created: 2021-04-09 11:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c451ed20a8a487dcb17c738207c4a7fb SHA-1: 9937adf9ff1ec90ae05f2a46d29a62595de0d66c SHA-256: acafc279413616e28d123ab5f28fcc06ad9b09c3ddf0b42c328128928a26bc43
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9995

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://fokemale.ru/strik?utm_term=how+to+remove+samsung+monitor+mount PDF link annotation
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/wurevavuzefura.pdfIn PDF document text
    • http://autokenn.com/vunitidixosoxijebuketemawjj7n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415518/normal_604bb6e5d9fe6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_6011e8ae90f14.pdfIn PDF document text
    • http://dmdmassage.com/why_java_is_known_as_platform_independent_language_explain_some_feature_of_javakg3y4.pdfIn PDF document text
    • https://peliwotamo.weebly.com/uploads/1/3/5/3/135325711/vukorepome.pdfIn PDF document text
    • http://unityfree.xyz/42060278092knv2t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_605ad317e68ad.pdfIn PDF document text
    • https://rigepapesoruzu.weebly.com/uploads/1/3/4/5/134519565/doganawadikuw-morugunowima-bunadofaja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482847/normal_5ff7c921f4163.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449004/normal_603d85e475eea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472491/normal_6058b5bf0ab37.pdfIn PDF document text
    • http://ultra0.space/rodegejuturelavepoxovubo03wt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390664/normal_6005e9dfcf324.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/wewikonid-waganuxoletaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490934/normal_602adf3f24a26.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/zaxawetawupo/senititetoponakuletukowo.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/stihl_hse_61_electric_hedge_trimmer_review.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/general_characteristics_of_bacteria.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/rumobonamuxuduf.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/varicela_zoster_en_adultos.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/how_to_set_google_map_location_in_my_website.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_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 5084 bytes
SHA-256: f5fd1d3c8f3a96a4130220922aae917b66af14e1deef2ce9ac5a0e761120ed64
font_01_sfnt_off0000fa08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA08 10664 bytes
SHA-256: 3359a5fd5dd42349c945271189bfcc938baafe1d3ac30fb2c4f674f1b6b48940

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