Malicious PDF — malware analysis report

Static analysis result for SHA-256 de39769c8cc88f15…

MALICIOUS

PDF

103.1 KB Created: 2020-11-26 07:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6bf69ab0ff5a6f012aa6b03021809adf SHA-1: 9235579ff340031b64fc9dc05b62ea38643d6974 SHA-256: de39769c8cc88f15a8416a2a91d5d1760f811b83bc4ff34a403de3a6bac9653a
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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/123?utm_term=tera+priest+dps+guide In PDF document text
    • https://sijilosak.weebly.com/uploads/1/3/4/4/134476358/piwufolajenabab.pdfIn PDF document text
    • https://zefipomez.weebly.com/uploads/1/3/4/8/134882075/naridav.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://s3.amazonaws.com/xamapebonijos/zagolepibikekaxoxuxutev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64db6ec9-b979-49fc-9b7c-955a58d4e0ec/32636483698.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/because_someone_we_love_is_in_heaven_quote.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/bakra_eid_mubarak_images_2019_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3c5f1fb-1813-4c07-a471-de957cee9373/papikofasemidosiruzu.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/gipajoremujon.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/39739289962.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/sentence_fragment_and_run_on_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e12ecab2-ab76-4c30-9b8b-67e1a9a24181/55201519765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db7c6c4-f383-4921-989c-3a3832d32fc3/denver_metro_protective_services_jobs.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/wujamoxedezikazogovuwov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/837c8ba0-dee8-4a4a-9799-cd287808cadd/47094766579.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/terminator_dark_fate_2019_box.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/tilumiw.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_off000149d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D2 4708 bytes
SHA-256: e036f307f2f7e888e44c46736d1b877e36a42999007058c1ba903448e92a9012
font_01_sfnt_off000159e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E3 11700 bytes
SHA-256: 81bd14c9d478c45d5608b232a06e05515332aa0bf2156e8faf4bad777f3d0c7b
font_02_sfnt_off000180ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180ED 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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