Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f1973b906b138d…

MALICIOUS

PDF

58.6 KB Created: 2020-11-09 18:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e5b60fc6b23ee7c7de146ae83508a7b2 SHA-1: d662ab70d3234f27518e485d954c3e62dec59fda SHA-256: 84f1973b906b138d3e0aba5231b45f8037797eff15efba8c1b49e2e65e9f1f15
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://cctraff.ru/aws?keyword=dell+inspiron+one+2020+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418556/normal_5f9d8cb93726e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5f904d863dfdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5f91f8a841894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5f8b5749ba718.pdfIn PDF document text
    • https://jizidetaji.weebly.com/uploads/1/3/4/6/134626841/xidaxekagobamagi.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/felasorarabipis/lekaledutuzugemomip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab542939-0720-4c31-bf62-1df644f39de2/11355219738.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/fare_v_michael_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5454d56f-4554-465c-854a-07157fb95cd9/84846746645.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/alternative_investments_industry.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/nobokalewig.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB12 5240 bytes
SHA-256: 149c50aa63fb0b2f6056a7de83007b83d88e423873e86f7acf849ea656b9827f
font_01_sfnt_off0000bccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCC 10040 bytes
SHA-256: f073d23aa62d54a00d8d01443e2b3365b877e77ee71b4f701f16d0289161e7bd

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