Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd431199b8ea786…

MALICIOUS

PDF

69.7 KB Created: 2021-02-23 00:52:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6d80b012654b9c68d90105bade72101a SHA-1: 4b7ed09cbf2a5b75e06e54dd9bdddea8d601a248 SHA-256: 8dd431199b8ea786ccef1899a35a57100612c68ce279b7e2b33919a2a0e96c09
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL leads to a site that appears to be part of this farm. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to phishing sites or other malicious content.

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
  • 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://leonvi.ru/123?utm_term=medidas+de+prevencion+del+covid+19+en+el+trabajo PDF link annotation
    • https://xatiletovolut.weebly.com/uploads/1/3/1/4/131409128/mopevufobitapomome.pdfIn PDF document text
    • https://lebipogife.weebly.com/uploads/1/3/5/9/135990957/fivaxapive.pdfIn PDF document text
    • https://fobinoxibenor.weebly.com/uploads/1/3/1/4/131437242/8bf71.pdfIn PDF document text
    • http://liko-sneakers.com/does_taco_bell_serve_their_full_menu_all_dayyubdh.pdfIn PDF document text
    • http://steh-sistem.ru/fupinenawevewuronev0k6.pdfIn PDF document text
    • http://azorocheat5.xyz/gate_2020_form_requirementsd4581.pdfIn PDF document text
    • https://rejobasagiletez.weebly.com/uploads/1/3/4/6/134642313/731230.pdfIn PDF document text
    • https://xogegexisupu.weebly.com/uploads/1/3/4/3/134319275/5687793.pdfIn PDF document text
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/33449.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tifilumiteva.epizy.com/94428609656.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/stealth_cam_xs16_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/godafumup.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/regunafara.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/17676847125.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/33534443254.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/sedudokezokugivavafediv.pdfIn PDF document text
    • http://lesuzikabe.epizy.com/10310480104.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_off0000d34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34A 5556 bytes
SHA-256: 40c43c8f6769da83b06cf648f6fa88611883ff7a26264552d49d1475b582bb66
font_01_sfnt_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 10900 bytes
SHA-256: 4e37993fbcac1e2a40676126dab55a7624be4fc19e6d7948439a75aa514c0b2c

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