Malicious PDF — malware analysis report

Static analysis result for SHA-256 e702835457ff46d8…

MALICIOUS

PDF

68.6 KB Created: 2021-02-02 07:42:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1af6d3a64c052390262373a2b01be08e SHA-1: 5e4dfbb432109390e6d98d9c0ead11865d5016ce SHA-256: e702835457ff46d8972cae9ef815a3489681409fb392b39ee9baddd64ddb636c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files hosted on various domains, suggesting a link farm or distribution network. The heuristic PDF_SEO_LINK_FARM specifically indicates a mass of external PDF links. The presence of a URL related to 'how do keloids form on piercings' in the document body, combined with the ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution lure. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

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://baarspo.ru/aws?utm_term=how+do+keloids+form+on+piercings PDF link annotation
    • https://cdn.sqhk.co/gukokefa/zihpBhj/65495962431.pdfIn PDF document text
    • https://cdn.sqhk.co/kixeworu/dDgijjW/6822624352.pdfIn PDF document text
    • https://cdn.sqhk.co/vedafigula/jtTibau/7202310220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528959/normal_5ff1dcc39ae01.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/9047139.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/g64Gu40/halloween_runner_108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454420/normal_5fd2a45227742.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/eljaoKW/history_of_world_civilization_course_description.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/pofojerer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/97786666598.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/83981053979.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/riscos_ocupacionais_enfermagem.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/cisco_firewall_asa_5520_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/vaxutobaxugejajigawuwu.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_off0000ceb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB5 5380 bytes
SHA-256: e44b1660d9a3b1e6fd09a9166f5339769f7ea9f5f5a0dd715f9a1bc2d9cffe75
font_01_sfnt_off0000e108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 10672 bytes
SHA-256: f8755f01b2094f150d31f31afaf4281ca71b0d399fe1f4a5e17d62bc0b970e08

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