Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93a5139fc17706d…

MALICIOUS

PDF

72.7 KB Created: 2021-02-18 07:14:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 557c19f0e1932156189dfe543aababac SHA-1: dcf4f6dc986282265d21facf1e179b7f9906497e SHA-256: e93a5139fc17706db0fd116588b3e115281b374daec0837be57a201c57933ddd
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=what+i+love+about+you+book+prompts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4471106/normal_5ff028a2813b2.pdfIn PDF document text
    • https://puwikemumej.weebly.com/uploads/1/3/1/4/131454306/b571696804778a.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/sabofotitibevjrwm9.pdfIn PDF document text
    • http://optalpha.com/bison_parser_manualrlhgu.pdfIn PDF document text
    • http://shtangye.xyz/child_of_mine_carole_kingczx6i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_6026eaf2c0e26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491723/normal_6026bf9d663a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471249/normal_601b2eb69cd07.pdfIn PDF document text
    • http://mon-cmb.best/how_to_apply_at_rosss806y.pdfIn PDF document text
    • http://swiss-gear.store/bivakujokadelaxo9xnn9.pdfIn PDF document text
    • http://24magazine.ru/zefapododvyh2r.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/midizaxopazeji/komiguxovozatidojipiwed.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/chrono_trigger_rom_gba.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/bangla_tv_hd_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/blueyonder_email_settings_android.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/puzesazazadosenoweloba.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_off0000e05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05A 5436 bytes
SHA-256: d9c4c2e9f87875125e35b7db76de669f73ff6adc86c92a6109d4c685fa7415c3
font_01_sfnt_off0000f2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BF 10136 bytes
SHA-256: 1f80742713d3a78db9b1db28cc8ff98cf28f1f2d796ed0cdc98e38545a7d1e41

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