Malicious PDF — malware analysis report

Static analysis result for SHA-256 f561e448893ba361…

MALICIOUS

PDF

78.0 KB Created: 2020-11-29 01:23:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5dfdcedb6d5ae64097bc065f640d3c11 SHA-1: bd02cf0479505ba8f5df2884ada9429c97d9711c SHA-256: f561e448893ba36127000e493b8b545d9f23c73f1ae5c1c00d81259b5e889ff4
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating it is designed to redirect users to external websites, specifically identified as an SEO link farm and a redirector for free downloads. The primary malicious URL identified is 'https://trafffe.ru/123?utm_term=hide+labels+google+maps+api', which is likely used to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafffe.ru/123?utm_term=hide+labels+google+maps+api PDF link annotation
    • https://mewuvirinikupu.weebly.com/uploads/1/3/4/5/134505229/nalonesefefomog-lobig-medujetubabum-tigebob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370087/normal_5fc2d7bdc6455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5f8ce74b66626.pdfIn PDF document text
    • https://pixijitawe.weebly.com/uploads/1/3/4/5/134593468/179528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_5f9d2dede608b.pdfIn PDF document text
    • https://gokimojesip.weebly.com/uploads/1/3/4/5/134595710/4118171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5fa49e37aba4d.pdfIn PDF document text
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/vigeko_vebode_mepolofivizurak_moratewapunuka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/19c59ea5-5ca7-429d-874a-53405e8fe339/junaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eebcd5da-d798-41e0-8b74-ca1847e8fb3a/raderubog.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/dokkan_summon_animations.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_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 5284 bytes
SHA-256: ac6a1d1aea2f99deb54ec90d3bb7ada973ecb2d7cc71c995b8bcffd4bca6944b
font_01_sfnt_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 10544 bytes
SHA-256: 3120e99fd109b417460206eb67283469b2a96ba4f3fe25b13eb7e5a7a6431c73

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