Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ecdabec5aa58d1…

MALICIOUS

PDF

105.9 KB Created: 2021-04-03 21:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 68c4d956ef717f206e1d21109a53c221 SHA-1: e34ac30f0b447de7811171ccd25e6cced5920895 SHA-256: 22ecdabec5aa58d1c6c15d4b4d434eff8c6df124926bd16a04e8aed788b20bb3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://dugedepap.ru/award?keyword=estrategias+de+afrontamiento+en+ni%25C3%25B1os+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422893/normal_600e50dbe9bc2.pdfIn PDF document text
    • https://xomugewobi.weebly.com/uploads/1/3/0/8/130814749/gapopupusoz_mavareke_napilimuz_wasavumadufuziw.pdfIn PDF document text
    • http://ductsunlimitedins.com/suzuki_drz400_service_kit9uu5b.pdfIn PDF document text
    • http://tevoriveterusof.22web.org/72572320162.pdfIn PDF document text
    • https://joposiga.weebly.com/uploads/1/3/5/3/135399072/pojibuj.pdfIn PDF document text
    • http://ottics.ru/9231976855869gzn.pdfIn PDF document text
    • http://regetun.22web.org/59342945166.pdfIn PDF document text
    • http://bettermoneytips.com/organic_chemistry_vollhardt_7th_edition9ifwp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378410/normal_6049c60f1ddfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459916/normal_6065defa7dd82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474475/normal_5fe837c2d25a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuzatazuji.epizy.com/beats_studio_headphones_wired_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/fire_alarm_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/51386392168.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/22792361724.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/how_to_check_epson_ink_levels.pdfIn PDF document text
    • http://sifuxugod.epizy.com/thomas_calculus_1_2_trke.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/mimuniwegemumivinewi.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/ird_income_tax_return_companies_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jugobimuraje/spring_mvc_tutorial_for_beginners_netbeans.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_off0001527d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527D 5496 bytes
SHA-256: bd92ca1a1d7d3880665e953d7a1b2b93498887396708a909f91f3eac4ca2dde0
font_01_sfnt_off000164d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164D5 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00016d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D62 13756 bytes
SHA-256: 5887653575586ee1deab5db866c2d04e85124de97a7320a6517c9a72877b5d21

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