Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a15f94c1fd71e59…

MALICIOUS

PDF

82.3 KB Created: 2020-12-27 23:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 84cd0b6130a00da5ddcc500f6f4f24ee SHA-1: d1a54c393e66a4902e3efe67c0a430482ee563f5 SHA-256: 2a15f94c1fd71e59383667344cc023a57668d03cc83b103106f777e40e1e3708
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' heuristic further supports the phishing lure.

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://trafftec.ru/strik?utm_term=f1+2016+mobile+system+requirements PDF link annotation
    • https://wevupifusa.weebly.com/uploads/1/3/4/3/134356286/849142.pdfIn PDF document text
    • https://kolivobaka.weebly.com/uploads/1/3/4/5/134500933/nisapomikej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408475/normal_5f9fe0957dc54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_5fb2d5ee603f4.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/222691ae7750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474446/normal_5faba09a4cdfc.pdfIn PDF document text
    • https://sebezubajisiv.weebly.com/uploads/1/3/0/7/130740163/ff3eb07dd9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/dc04042b-fac9-4342-8718-3273e884e9fc/85975509609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88d184c3-cd68-4478-8cb4-6705b10c4c38/nagibirilujipeviwanenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4208b917-1c60-4de0-bb71-5d3ca1a95187/32979249484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0290ed16-dfdb-421f-9696-4260b870d946/dell_inspiron_3847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/222eabe4-c0ac-4b6e-962a-9a3ccc3d9eba/fiverr_success.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 5308 bytes
SHA-256: 638197cd2087dbacb112e7789a57a08c09dbd1eff297363cd2caa5bc4e27a545
font_01_sfnt_off000105e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 12164 bytes
SHA-256: f2f2c33260e0d7d1be6297e999ea9502ef80bdab022a8f52b0042d8d554f9b01
font_02_sfnt_off00012e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E26 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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