Malicious PDF — malware analysis report

Static analysis result for SHA-256 375c80118a1d89b7…

MALICIOUS

PDF

87.2 KB Created: 2021-02-14 13:32:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8fd432fe93098bcea21db20960d04573 SHA-1: 9b9237a3ae7de67985eee0b2f93fa4e25771ada9 SHA-256: 375c80118a1d89b7a0631a3028dd95125e66ef0efbaee1ce00b42c57a951bb55
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 suspicious and point to domains commonly used for malicious purposes. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external link farm, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to 'babysitting proof of child care expenses letter sample', suggesting a lure to disguise the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://jottigo.ru/123?utm_term=babysitting+proof+of+child+care+expenses+letter+sample PDF link annotation
    • http://daravto18.ru/51281187839iph2r.pdfIn PDF document text
    • http://zerkalo-fugicar.website/ielts_latest_essay_topics_with_answers_20196edoe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_601db3c96eb98.pdfIn PDF document text
    • http://grantmedica.ru/durobawo6cnnv.pdfIn PDF document text
    • https://bazifimu.weebly.com/uploads/1/3/4/6/134661545/c5e599ef225d2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_600f9d220f92a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402294/normal_601b1aa073009.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/jLDLUhI/zagalegigaxom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481676/normal_5fe0a36a5939b.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/jcnlXih/hitman_3_vr_steam.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/bjdichg/13540060547.pdfIn PDF document text
    • http://instapresent.site/galozominokemiwipibobiplpc18.pdfIn PDF document text
    • http://remont-kholodilnikov.website/70847589535qsou7.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/nonoxe-juvese-bodezol-lofupurazi.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/sedowedi/bus_game_install.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/lenokudakagek.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/acp_guidelines_diabetes_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/kuwise.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/wepiwolovipewivez.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/bricscad_v17_free.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/bengali_movie_website_free.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_off0001137a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137A 5928 bytes
SHA-256: c3d230ac69cb2a03fb918b5e6eb51c7506b471050c68119bf2f6b45d085f264d
font_01_sfnt_off00012790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12790 11120 bytes
SHA-256: 1f8738646fe93fe9eb7f65d33bd744cc670ac0359dc5a3520f5cb1e0d180b1c0

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