Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cca8f03b3b7dd51…

MALICIOUS

PDF

78.7 KB Created: 2021-01-08 18:59:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b8437788beb76a86a391aa5bd1833333 SHA-1: b1a51b08762fa45c6cd50002de0037fc33e7868e SHA-256: 9cca8f03b3b7dd512c70dcef66ed3a0d4e35b7c2812c31ea38ef49e707d77dd2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/123?utm_term=what+is+a+corpus+luteum PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486971/normal_5fdee7d62f8b9.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/e59b1c97a414.pdfIn PDF document text
    • https://lemisisax.weebly.com/uploads/1/3/4/4/134494561/zugobava_nalujasesagugu_jizugokaf.pdfIn PDF document text
    • https://lokamafurixese.weebly.com/uploads/1/3/4/5/134509290/dulunivoli_xevovefud.pdfIn PDF document text
    • https://nawopudupavipe.weebly.com/uploads/1/3/4/8/134856820/japulopojezepoxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_5fa09d2397e03.pdfIn PDF document text
    • https://cdn.sqhk.co/vitozogog/janhgKu/56790322260.pdfIn PDF document text
    • https://sidatugalelukad.weebly.com/uploads/1/3/4/6/134639108/xosob-pedeniwoz-xiranapajon-tojukazuvokegox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421039/normal_5f9caa9add161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5f9d138805e13.pdfIn PDF document text
    • https://votumojelobi.weebly.com/uploads/1/3/4/8/134848055/monoxadox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/84852ae9-e0f1-4eb2-a1fc-60dd52587123/71605870647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8da5a13-1817-44cd-a4e3-c2c482c9ecb4/spinny_gun_mod_apk_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 4964 bytes
SHA-256: f8b6c902ba65597fbd8f04f870c933c117830135e44b1e7162a3e742060b8d8e
font_01_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 11028 bytes
SHA-256: 1ce25258d3f587592e755981f8ed35d890f1ede3be6f82a9b32674bd36223158
font_02_sfnt_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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