Malicious PDF — malware analysis report

Static analysis result for SHA-256 2373bcf5289c9b0c…

MALICIOUS

PDF

63.1 KB Created: 2020-11-20 12:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: c1d3d3b609be21e30937fe23048dc02e SHA-1: 766ccf690f603060c5ab041e983387c7425e07fd SHA-256: 2373bcf5289c9b0c601d5a3a2b2ad89de3c73c202e231c3b76633f8d8814a6a9
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing indicating it is a malicious redirector link farm. The primary URL identified, https://gettraff.ru/123?utm_term=garo+mounts+ffxiv+how+to+get, is likely part of a campaign to drive traffic to malicious sites. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

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://gettraff.ru/123?utm_term=garo+mounts+ffxiv+how+to+get In PDF document text
    • https://cdn-cms.f-static.net/uploads/4423189/normal_5f993800eef2b.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/427d15eda48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404738/normal_5fa5baf30cb33.pdfIn PDF document text
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/dajelitosagik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410952/normal_5f93a5773ade3.pdfIn PDF document text
    • https://wudigunufite.weebly.com/uploads/1/3/4/6/134611509/200826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_5fb3d1f4ea777.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/8e3e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417046/normal_5fa1cee0bf1bd.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/ccf424cf-9311-4d85-ae19-d4a9cba6f4f1/sonia_nevermind_free_time.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/32507133381.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_off0000bb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB34 5400 bytes
SHA-256: 179b22d02b1033a7ac62ce9b2c7fd179d13120b991e585eca09b844b65e0b35a
font_01_sfnt_off0000cd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD89 10108 bytes
SHA-256: 41065a79a7cd24e8282d7995edfd442b82e41364739e32143448486375b9eb63

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