Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b98bffbc4f3e76…

MALICIOUS

PDF

85.3 KB Created: 2021-03-19 23:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7dbc0d00b53cc97efd2e10366c60c844 SHA-1: 5e76c5c880ad2019a745b9d09ef70f21db71608e SHA-256: 50b98bffbc4f3e76cf6ea48a48ee3bd1274e124a378f54e8646b95e0678c2310
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to 'Kenmore gas range troubleshooting'. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://pelibifir.ru/123?utm_term=kenmore+gas+range+troubleshooting+guide PDF link annotation
    • https://zirilomeme.weebly.com/uploads/1/3/6/0/136025267/f0bf99864.pdfIn PDF document text
    • https://merasata.weebly.com/uploads/1/3/1/3/131378960/0b65e34.pdfIn PDF document text
    • https://pizopivawot.weebly.com/uploads/1/3/5/3/135347149/wanolewesigot.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/cjggm7f/didier_drogba_stats_transfermarkt.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/jbJNTvN/dipaxemaxod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386822/normal_600ddc3c2171f.pdfIn PDF document text
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/8194266.pdfIn PDF document text
    • https://nugumogixowujo.weebly.com/uploads/1/3/1/4/131437940/8556648.pdfIn PDF document text
    • https://vakitisize.weebly.com/uploads/1/3/4/0/134017930/lewajixedikus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365626/normal_6001e5f786c26.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/tO1gfc8/fall_guy_game.pdfIn PDF document text
    • https://nuxofenaf.weebly.com/uploads/1/3/5/3/135306259/6b31da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/10b28d03-7cc2-47ae-8ed9-b7aeac9105cb/38370425031.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/how_to_replace_blades_on_oster_turbo_a5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39e882c6-e6ae-44f7-969f-03d7d376af23/73405561100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeda647d-edab-44e0-bdae-61ac2c47933b/bryant_trouble_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b336acf-35f2-499c-898d-1661b2b6e61d/emotional_intelligence_daniel_goleman_1995.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/62846584244.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/wunujujen.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_off00011165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 5348 bytes
SHA-256: f58bb86b53076f3343d5dfba24c56f35b5cec2ff97d7fe5fcd0598e45ba14ded
font_01_sfnt_off00012363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12363 10816 bytes
SHA-256: 0d53fa28eaee7d773c95ed67cdb9a96a6e424969548db2cb219890968158d75b

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