Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba118e8a6a54584…

MALICIOUS

PDF

73.7 KB Created: 2021-06-09 00:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fb8bd28de9d4f63817394a2e31113b65 SHA-1: 65fcb2d4231cde293610b1b4645e181666956bc5 SHA-256: 4ba118e8a6a545843081944a1d4acc02b1049a966c666f8240fe1e1170af77d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which are part of an SEO link farm, and one specific URL is presented as a lure for a 'Windows 10 product key'. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The presence of multiple external links and the deceptive content strongly suggest an attempt to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://synerhu.ru/pbw?utm_term=windows+10+product+key+2yt43 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426813/normal_603b4fe20d841.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368497/normal_5fe55a53a6519.pdfIn PDF document text
    • https://wegizitog.weebly.com/uploads/1/3/4/6/134685086/cafa401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379054/normal_6014d553eeec1.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4391620/normal_60b0b9366ddf2.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/mapuwuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_6049d5104d4bb.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4465393/normal_60b06198bebf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455645/normal_60365e7dee4c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_60395e02d0068.pdfIn PDF document text
    • https://nenomoxemobare.weebly.com/uploads/1/3/6/0/136010140/197b9cd07.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4460461/normal_60afec2b8f91a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387712/normal_5ffc363b6a3a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_60292eb5edc5c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b7a6d3-8d3d-4658-a708-c0c03f569af2/book_report_outline_7th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de5910fe-4c78-4ae4-bcaa-cae375d2d246/zamolinafapotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7004c149-7efd-41d8-bc0e-041645eac75b/harry_potter_video_game_2020_nintendo_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2984eb08-0de6-44ae-9678-5ec252b9eae2/xezigevor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fc5d7e1-7416-46d1-bbb4-64141203c7df/singer_portable_sewing_machine_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2f279a-7dbc-4d11-99e2-9b9495512516/jegaruletudugipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9361c776-f8f8-4954-bb88-055feeed79fc/fenokuzikotugawefa.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_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 5672 bytes
SHA-256: 9cfdcaa137082e097e678eae68d8a8d45591b2429fb9dc716631734df0a1e26e
font_01_sfnt_off0000f506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF506 10764 bytes
SHA-256: 61fcad6d4c7f2894c7bf15422580535ea57f42bf88ea4de97a67fbbf8d36c484

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