Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70bab265338e2c2…

MALICIOUS

PDF

73.3 KB Created: 2021-02-02 19:06:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 250b81112f7fed089e8c1e13eb7c0722 SHA-1: c40e47e502253b9d46626d5ae2636a59b7b1dce4 SHA-256: f70bab265338e2c2b194a008a014a3437606446e0c57c21033949273cfeb161c
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external links, including a link farm heuristic firing that points to http://lawupoxag.epizy.com/kosiki.pdf. Another URL, https://baarspo.ru/123, is also present. The document body is heavily obfuscated, but the presence of these links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=medieval+vs+renaissance+vs+baroque+music PDF link annotation
    • https://cdn.sqhk.co/nepofigiper/gBiaigK/list_of_animals_and_their_sounds_in_tamil.pdfIn PDF document text
    • http://rapisakaxo.66ghz.com/83767345866.pdfIn PDF document text
    • https://denijebif.weebly.com/uploads/1/3/4/5/134584122/gulez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369329/normal_60031c10d9c48.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/bWMA6ji/33085498394.pdfIn PDF document text
    • https://fanamavikere.weebly.com/uploads/1/3/4/6/134610997/tepiwabefepav.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/ICRjigj/dolorumevewira.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465018/normal_5fe555406c549.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lawupoxag.epizy.com/kosiki.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/understanding_stock_market_for_dummies.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/zaridofan.pdfIn PDF document text
    • http://fixadamobus.epizy.com/infinitive_worksheet_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/auto_motor_und_sport_formel_1_sonderheft.pdfIn PDF document text
    • http://musubokem.rf.gd/software_engineer_cv_template_microsoft_word.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/schoolboy_q_oxymoron_album_zip.pdfIn PDF document text
    • http://kunipotow.epizy.com/89401744484.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/rebunusinefedik.pdfIn PDF document text
    • http://banolepepo.epizy.com/uncle_tom_s_cabin_study_guide_answers.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_off0000e29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29E 5416 bytes
SHA-256: cf434bd072a7eeaf6e1f8ce18226091461ace36e70b8df7eac10583e5464abc1
font_01_sfnt_off0000f504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 10196 bytes
SHA-256: b27f2189cdb34618954ff7b934d3de0402a9b07acc23b0d66aa7427682c3fefe

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