Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc29198646aca227…

MALICIOUS

PDF

73.5 KB Created: 2021-02-27 14:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: b0f89ef3e5519771fe39d17ae204100f SHA-1: 4787249cb6b0cb3789b9349e925ac91cceb57beb SHA-256: bc29198646aca2272f860a2cbc1fb3bc4588694cbdf77427f88becccf6e2093f
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or known redirector infrastructure, suggesting an attempt to distribute malware or phish users. The presence of a link to 'crophysi.ru' with a keyword related to testing calendars further supports a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=nycdoe+testing+calendar+2020 In PDF document text
    • https://loniforuwo.weebly.com/uploads/1/3/4/9/134904684/ed840fe3d2.pdfIn PDF document text
    • http://tonalemeketav.66ghz.com/xomirewuxikebubujotatu.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/hEje28W/netodixujejupimiza.pdfIn PDF document text
    • http://card2card-perevod24.site/ganumujupiku55tq4.pdfIn PDF document text
    • http://edaruzal.xyz/6410411549393mtn.pdfIn PDF document text
    • http://drnextact.xyz/dice_tower_diy_wood5m4wr.pdfIn PDF document text
    • https://nurifekuti.weebly.com/uploads/1/3/4/5/134516663/dupusid-kunewija-xeveg.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/suxejelozopowuwegebaki.pdfIn PDF document text
    • https://fomunova.weebly.com/uploads/1/3/4/6/134684458/2191944.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/ge7Kmja/offroad_cruiser_simulator_2.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/what_does_lll_mean_on_maverick_thermometer.pdfIn PDF document text
    • https://worizura.weebly.com/uploads/1/3/1/4/131437573/62398e39fca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mofagadelebedos.rf.gd/lagu_worth_it_mp4.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_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 5452 bytes
SHA-256: b17b8923798268d4d34a559580939ef40ae909dd19328932faec21a41c941a48
font_01_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 10504 bytes
SHA-256: 186b2644a46eb6224316b8ec0831d93dcda042ecbdd826fb6b474b7363c1c84a

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