Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2b600df853ca2a…

MALICIOUS

PDF

72.5 KB Created: 2021-02-11 21:39:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 739c07f625edec0c8df84b366f4441c1 SHA-1: 63bfabd661a23d0effa4f664ae244f51359b31d9 SHA-256: cf2b600df853ca2ac20c622d31fed9c662f495b421a3a29d1e94771472bba047
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on dynamic DNS services or appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

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
  • 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://baarspo.ru/wb?keyword=armorseal%20650%20data%20sheet PDF link annotation
    • http://lnstagram-blue-badge-form.com/resume_format_for_job7jshf.pdfIn PDF document text
    • https://kowasazupajobex.weebly.com/uploads/1/3/1/3/131383373/1706255.pdfIn PDF document text
    • http://ingmijn.com/89425300217myfjz.pdfIn PDF document text
    • https://ronewomiz.weebly.com/uploads/1/3/0/8/130874064/jawasa.pdfIn PDF document text
    • https://xevupuwikuguv.weebly.com/uploads/1/3/0/8/130814145/walimezulofepo.pdfIn PDF document text
    • http://birjand.design/8199657174834tmf.pdfIn PDF document text
    • https://birugenok.weebly.com/uploads/1/3/4/6/134632973/nolikitilude.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://goguvero.epizy.com/29866507373.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/calculus_larson_9th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/letter_n_coloring_sheet_for_toddlers.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/desktop_backgrounds_for_windows_10_free.pdfIn PDF document text
    • http://jovigoxuja.epizy.com/33300285934.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/mhw_iceborne_velkhana_guide.pdfIn PDF document text
    • http://gebozobab.epizy.com/car_driving_games_hack_apk.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_off0000dafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 5476 bytes
SHA-256: 744068fb2f8f0dbec6cca3ccb8a7c24ecff50aa3cb074c61cc4caa88c2cfee53
font_01_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 11564 bytes
SHA-256: df54e8f22ca928b9aa3d11b0688e1eebbbb0037b8954482b9541284f9eb80c35

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