Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ace66579265e5c…

MALICIOUS

PDF

88.8 KB Created: 2021-02-22 17:00:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5470c80b771f8f132a14b3035a015be6 SHA-1: d6d95784d65c8e70a62bae0e4bbf1526a636805c SHA-256: c3ace66579265e5c10d05de12ed17834c49a0c86d3e69322ddd268ff6166637a
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan threat. The heuristic 'PDF_SEO_LINK_FARM' indicates the document contains a large number of external links, likely to further malicious content, and the 'PDF_URI' heuristic points to a specific URL that appears to be part of a keyword-driven lure. The document body, though heavily obfuscated, contains text related to 'Aetna otc catalog 2020 cvs', suggesting a pretext for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/wix?keyword=aetna+otc+catalog+2020+cvs PDF link annotation
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/bdbc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479905/normal_5fc9d66d28bcf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403540/normal_5fe26ed2a8819.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473622/normal_5ff3d3667ab92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460476/normal_5fe5ebca9e2bb.pdfIn PDF document text
    • https://zovakilezogavi.weebly.com/uploads/1/3/1/1/131163957/0d273c942b.pdfIn PDF document text
    • https://sidomepavoresob.weebly.com/uploads/1/3/5/3/135322675/pizusu_valepupube.pdfIn PDF document text
    • https://xijonezamo.weebly.com/uploads/1/3/1/4/131407630/basokemuvu.pdfIn PDF document text
    • https://wejafivikime.weebly.com/uploads/1/3/0/9/130969279/5051326.pdfIn PDF document text
    • https://vaforiduzaxofa.weebly.com/uploads/1/3/4/3/134367440/gokeseku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449614/normal_5fd66735b2200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_600f18abb696d.pdfIn PDF document text
    • https://tobosuxonekid.weebly.com/uploads/1/3/4/4/134493818/52e478d54da0b.pdfIn PDF document text
    • https://giridoxaxe.weebly.com/uploads/1/3/4/7/134703098/6c3902598ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 5196 bytes
SHA-256: 1a9d9de77eb400df80c0975f9d0ca4c8a49512ac4cc2b6a2552f99f691c76d85
font_01_sfnt_off00011b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 10752 bytes
SHA-256: 071bb2704ead0dd2646f8ded558d34beeae868f0d5aecf2beff7f313b242ff98
font_02_sfnt_off00014062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14062 16232 bytes
SHA-256: f260341e2deafef282c0cdf6f9547f7c1575836931e00f2cecf0e77490754097

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