Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb552305ccf95d23…

MALICIOUS

PDF

99.5 KB Created: 2020-11-22 16:27:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 213335bf46c77a27d6049e3f6ecce816 SHA-1: f55839b38ab73f11c342fa9caa9cc23badb51604 SHA-256: fb552305ccf95d238b64218e94b362b2595e42eeb0ab49f56c13c48ed5192721
214 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were extracted, the embedded URLs suggest an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=motivational+interviewing+miller+rollnick+pdf In PDF document text
    • https://lajutiruwogow.weebly.com/uploads/1/3/4/5/134585316/defigejazomovexavoz.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/wukobonamatojev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425728/normal_5faa6a96860d3.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/denesanijibep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5faf5b5d475f9.pdfIn PDF document text
    • https://wusunipusu.weebly.com/uploads/1/3/4/3/134320006/81dc74f.pdfIn PDF document text
    • https://kaxokotul.weebly.com/uploads/1/3/4/3/134380066/2346580.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/9292d876-5a84-451b-84b7-195cca2b88b5/muxuvurabosuvugize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d744e17e-bf9b-4aba-aef3-88ad73a83a53/44880320625.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/muchas_vidas_muchos_maestros_resumen.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/epithelial_tissue_review_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/electric_stove_wiring_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/zokokamu/twitter_apk_download_for_blackberry.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/bangla_album_video_dj.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_off000138b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B0 5308 bytes
SHA-256: 626c12f97775862ddcaca4715b5cbf592d69c2cd117a11509efa1e22f82e4d33
font_01_sfnt_off00014ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC4 12220 bytes
SHA-256: b3fa95bd43da2d311042581795f0ad0d7b5124d7c570da14eb28bd59eca6d837
font_02_sfnt_off00017256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17256 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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