Malicious PDF — malware analysis report

Static analysis result for SHA-256 551772357f305be6…

MALICIOUS

PDF

72.6 KB Created: 2021-02-10 10:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6d60e9511e674ba1780af10e225eb4f7 SHA-1: 2d85526ca01c60b4b1020cc9dc907a1043979b1f SHA-256: 551772357f305be65659617fe58b1ff17f59d1c26a8c50570af15833e6171271
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to suspicious domains, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://crophysi.ru/wb?keyword=certificate%20of%20appreciation%20templates%20for%20word In PDF document text
    • http://cocobuka3.xyz/91227609558ihfm4.pdfIn PDF document text
    • https://fiwudarive.weebly.com/uploads/1/3/0/7/130775392/rinalozadisi.pdfIn PDF document text
    • https://sozetodu.weebly.com/uploads/1/3/4/2/134265488/todufumoxaze.pdfIn PDF document text
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/pilebunatotaru-rikevitilu-dexodobeze.pdfIn PDF document text
    • http://kotexob.iblogger.org/bsg_guidelines_polyp_surveillance.pdfIn PDF document text
    • http://jimupitakonumi.iblogger.org/fast_money_halftime_report_twitter.pdfIn PDF document text
    • http://pisodanijuke.iblogger.org/89446360101.pdfIn PDF document text
    • https://bawusazatodopam.weebly.com/uploads/1/3/1/3/131378774/topojit_xejidex_setotis_lasazum.pdfIn PDF document text
    • https://tamilazubi.weebly.com/uploads/1/3/4/6/134604156/powefomumufaxututi.pdfIn PDF document text
    • http://uniques.space/printers_square_apartments_baltimore_md4xftv.pdfIn PDF document text
    • http://naxiramomamaz.66ghz.com/2014_gmc_acadia_slt_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/pegowediralimid.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/34601044873.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/axis_mf_common_application_form_with_sip.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/analytic_geometry_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/mawobowujisogeluf.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/jewefokebexuginajupuvoguz.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/66449641339.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/52351728135.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/appointment_book_templates.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_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 5296 bytes
SHA-256: 6c6f9bfb014a7c78f3018383b869c25ebba13d59ddfc278ab6a6d24d3ef2a810
font_01_sfnt_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 10424 bytes
SHA-256: 688de40c3ff3f157e5c90ec002a82a627b42bea74bbe93ffc2ede5fbb3365df4

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