Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cba0eef85006b0a…

MALICIOUS

PDF

57.4 KB Created: 2020-11-11 06:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 094751d5d52067246b445fc2bc3d0374 SHA-1: e6f2d07f6eec1b05f768c9c9fa16439b18a0bc04 SHA-256: 3cba0eef85006b0af552322170b247c36a1eed779f6072447023b326ed23dd48
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains multiple heuristics indicating malicious redirection and a link farm, pointing to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?keyword=manila+mart+yelp In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365542/normal_5f9d04f54bce1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_5f997f231c213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5f9d6917873f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_5f9673599ad22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419193/normal_5f9bc7de91b6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415530/normal_5f9a3c2c39c55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_5f9e15d6c0a11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_5f9504c26a79f.pdfIn PDF document text
    • https://jejaxome.weebly.com/uploads/1/3/4/4/134443668/tisumo-fosopozo-tabofetakofeka-devabozixijufun.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/ee65d995-ac76-43e1-b217-dbe092b4cab6/23220653207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9edb59be-973e-4525-ab4f-84a1d378a253/jasoxilomujuravivutuvez.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/sbi_education_loan_affidavit_format.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_off0000a856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA856 4896 bytes
SHA-256: c37ab946fbf8dabf5ab6673c4319a66101773578d20b983bf9beb060b6c89dd7
font_01_sfnt_off0000b8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F8 9552 bytes
SHA-256: 174e5fd8e77319986aac0479d008979a473132b2b197db3661926216dea9ae0c

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