Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a495d9a337d0e89…

MALICIOUS

PDF

70.8 KB Created: 2020-11-26 07:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1d0ba37f2a8cb560ea5491f5d138a40f SHA-1: b7f6be2415b53f5c0fbf8cb06870ea449e00f6d5 SHA-256: 4a495d9a337d0e8923ec05c860ee0ae20dad3d77076eb471155b749c3731b8f2
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI and a redirector link associated with 'free-download phishing' suggests the document is designed to lure users to a malicious site. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics point towards a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafftec.ru/strik?utm_term=mpls+protocol+interview+questions+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424692/normal_5f981a7046b1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5f90858cea701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379611/normal_5f954860cf482.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/leguvefu/deductive_reasoning_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/zegomadoduzekulag.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/uniform_acceleration_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/jesijinamaxob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7000de99-9bc7-493a-a910-1bb7f6507ace/pisefunatabofonuka.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/lodigituxafove.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/baaghi_2_movie_hd_coolmoviez.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/pupopenosife.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 5352 bytes
SHA-256: b359a8d4839f5a3b614e4dd07b969f0daebca13dd03571361f6129c9a7848aca
font_01_sfnt_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 10256 bytes
SHA-256: c24635029c92a3e47deea11d3fe09132948502bafdf59de64368840c5a519a10

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