Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f04e8d5c95d50b…

MALICIOUS

PDF

80.8 KB Created: 2021-02-28 10:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 199fe00124113b7d493909a8cff4b038 SHA-1: 9c97928e97fed261ea66d47d3d6397e8b359ff3f SHA-256: 11f04e8d5c95d50b434dac8fb8d80e3690f9d841b68ac24292cd457f585bdf26
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/wix?keyword=classifying+triangles+by+sides+and+angles+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409797/normal_601ad9423fe88.pdfIn PDF document text
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/vubukulojiza-bovitato.pdfIn PDF document text
    • https://gozivuwedigati.weebly.com/uploads/1/3/4/6/134612943/lumulaji-vowupiserume-luses.pdfIn PDF document text
    • http://a1metromovers.com/346634725647y95a.pdfIn PDF document text
    • https://gefivepuli.weebly.com/uploads/1/3/4/6/134620723/849080.pdfIn PDF document text
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/e6e85a5.pdfIn PDF document text
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/rugez.pdfIn PDF document text
    • https://xunumiselodaz.weebly.com/uploads/1/3/0/7/130775676/kibonekeliti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385631/normal_5fef17e8155f3.pdfIn PDF document text
    • https://jupimoxojufe.weebly.com/uploads/1/3/4/8/134860775/3865488.pdfIn PDF document text
    • http://itabody.space/safedisaje7dyoi.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/best_convection_microwave_oven_in_india_2020_under_10000.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/samsung_crystal_uhd_4k_smart_tv_50_inch_-_ua50tu6900kxxd_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501206/normal_602e9b325e49c.pdfIn PDF document text
    • https://pevotugimu.weebly.com/uploads/1/3/4/7/134742342/2176a9.pdfIn PDF document text
    • http://mizolaresunade.iblogger.org/honeywell_commercial_thermostat_tb7220u1012_manual.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
    • http://femejuzi.epizy.com/51587343251.pdfIn PDF document text
    • http://funurebebepoti.epizy.com/97635659054.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_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 5380 bytes
SHA-256: de94d5439e413385b41202707835c9f3f833154e31134740ddfa36153002726f
font_01_sfnt_off000101f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F1 10212 bytes
SHA-256: 5cede6f5ea5650b7cc378f3b043d4a5ec1c44e35924a822932aaf98c29d05c97
font_02_sfnt_off000124ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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