Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ba8bad3d46b0b6…

MALICIOUS

PDF

109.8 KB Created: 2021-02-21 10:21:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3db773d86c8c9518773666589b05dd61 SHA-1: 9949440012c70dfc03209746d1639e3b6fd042ab SHA-256: a7ba8bad3d46b0b67e97e4cdf643f6dc672cfadf4c6bebbc62b823f365e593a2
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 pointing to PDF files, suggesting a link farm or redirection mechanism. The primary URL, https://baarspo.ru/123?utm_term=polaris+xplorer+400+2+stroke+review, is likely the malicious destination. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=polaris+xplorer+400+2+stroke+review
    • https://risimomumet.weebly.com/uploads/1/3/0/8/130814588/bapegazogovo.pdf
    • https://patapirebitogi.weebly.com/uploads/1/3/0/8/130814085/9584974.pdf
    • http://wadopipojadali.iblogger.org/40657762757.pdf
    • https://toziraza.weebly.com/uploads/1/3/4/5/134506396/liler.pdf
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/4219213.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/satudifin/xunusepaf.pdf
    • https://s3.amazonaws.com/lepefi/kebafakukaf.pdf
    • https://s3.amazonaws.com/bitajemisajoz/spellbound_game_free.pdf
    • http://kexasejuwodeji.epizy.com/wimolimapelusujejefutu.pdf
    • http://disupenepoka.epizy.com/bill_of_rights_text.pdf
    • http://mopuriruwinufi.epizy.com/idsa_pneumonia_guidelines_2016.pdf
    • https://s3.amazonaws.com/dudujopixejikug/lebefaxuborigalip.pdf
    • https://s3.amazonaws.com/gurowozenupifi/capture_app_for_pc.pdf
    • https://s3.amazonaws.com/xakajoziwibi/tukidepapamurubotekavosok.pdf
    • http://batogejupimole.rf.gd/61643498172.pdf
    • http://mivezemobopu.rf.gd/cartoon_hd_app_for_android_tv.pdf
    • https://s3.amazonaws.com/tofizo/costa_group_holdings_limited_annual_report.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001604b.bin
d5c6c752a21808cad14fffa4bf550c13fe3b1197bc9d2e746165f11badc17966		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1604B 5140 bytes
font_01_sfnt_off000171f0.bin
8f1bdb99f41f98d4fa0193f9afbe8bfa91cd4ac0ff412eb01701c052edbd937b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x171F0 12172 bytes
font_02_sfnt_off00019b48.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19B48 4324 bytes

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