Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab4cd058684f532e…

MALICIOUS

PDF

66.7 KB Created: 2021-02-09 20:53:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 35a5cf1f17433d8b109f15d0f499c6fa SHA-1: e789e4c4ea268cc66b45cfd9646bf5627326915f SHA-256: ab4cd058684f532e0ee90eeaa168291ff448969199ef28406186be74b3f697ae
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/123?utm_term=volume+of+prisms+worksheet+pdf+answers PDF link annotation
    • https://dilozerekake.weebly.com/uploads/1/3/1/4/131452754/68e6157.pdfIn PDF document text
    • http://makamar.xyz/kotidelatcb63.pdfIn PDF document text
    • http://hiziryigit.online/ginowevadagotoletexenithdi03.pdfIn PDF document text
    • http://springital.fun/jump_over_the_moon_meaningw9d3i.pdfIn PDF document text
    • http://dfds.in/messenger_app_for_macbook_progume5.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/6320541.pdfIn PDF document text
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/d6cb4f.pdfIn PDF document text
    • http://bioforce-co.site/3261869990dvyar.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/tolivajupeku/22442644577.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/butapukafigizosuvewawun.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/kaposizafejiwibinotapeke.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/jevalokimezex.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/engineering_construction_company_profile.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/apa_citation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/andi_mack_episode_guide_season_3.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/favegazewomunulizelonud.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/aaruthra_tamil_video_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/12629827837.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/chronicle_magazine_january_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/act_126_mandated_reporter_training_certificate.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/21386747875.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/27320561660.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_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 5400 bytes
SHA-256: a44d34260081d31c0c8911387c327c04e674559085a8b8da126347a8d6412f26
font_01_sfnt_off0000d9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 10404 bytes
SHA-256: 9c7cfd409e63e837c719c8d04cbcf486676423c1e63b4713ac7af79a5eba6ee9

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