Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb4056717b9dde0…

MALICIOUS

PDF

75.3 KB Created: 2021-03-20 07:11:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7f6f018981f5a220cd7ed4abb61f8e8f SHA-1: 516c06dd7391752e25d182bb6df62ddb8ff30641 SHA-256: ccb4056717b9dde0820eb2475cb0c28333e9901c4990307e98e3e9c903ad0360
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF download sites, suggesting a link farm or phishing campaign. The primary URL, 'https://xajibur.ru/wix?keyword=chemical+bonding+review+worksheet+key', is used as an SEO redirector, likely to deliver a malicious payload. ClamAV and ML heuristics confirm the malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://xajibur.ru/wix?keyword=chemical+bonding+review+worksheet+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4372371/normal_5ff64f15052f0.pdfIn PDF document text
    • http://de-bewertung-id2842384.icu/mukizitawasigubgmg98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366027/normal_600253e7697a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372955/normal_5ff5b8861b7be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459060/normal_600fe655b0cf6.pdfIn PDF document text
    • https://ranitezal.weebly.com/uploads/1/3/1/4/131438109/6aa004bd3857.pdfIn PDF document text
    • http://outputqwvk.space/information_security_controls_list928nt.pdfIn PDF document text
    • http://xaxebegolozagu.iblogger.org/dowalidolarigusapevisowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_60446bdd6f196.pdfIn PDF document text
    • http://insurancecarusa.com/navy_technical_jobs_2019_notificationgaiuo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_6051287fb1ed1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402246/normal_604361141fd9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_601e051f772f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503214/normal_5fd044a3d68d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485301/normal_5ffabf5c59e3e.pdfIn PDF document text
    • https://jokunotewe.weebly.com/uploads/1/3/5/3/135314966/kokijix-zukuwige-nuralo-wilexibunef.pdfIn PDF document text
    • http://neo-tp.ru/44751527660hy16x.pdfIn PDF document text
    • http://reawont.online/zevagujevuxokill7qqx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miwefonozez.epizy.com/letter_t_coloring_worksheets.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 8

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_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 5716 bytes
SHA-256: 0270d5a140dd7d921c1461f3db6deca2978a769d27266b9ea19d5e3ae4f8a073
font_01_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 10780 bytes
SHA-256: 58d3409cf287762db333e97b6ca25e6257817bea648064f8188024d47c669d03

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