Malicious PDF — malware analysis report

Static analysis result for SHA-256 1271320b3c142e50…

MALICIOUS

PDF

63.8 KB Created: 2020-11-25 23:01:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: da57f374f782564910de86191923bee3 SHA-1: 21c61456e2bf4ba3f966814d15be8940566fce4f SHA-256: 1271320b3c142e50d141b46b3f1a010cbfc37b57fac36e2400158ea60e006d61
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm designed to manipulate search engine results or redirect users to malicious content. One of the identified URLs, 'https://ggtraff.ru/123?utm_term=psychology+david+myers+10th+edition+study+guide', is flagged as a known malicious redirector. The presence of numerous external links and the malicious redirector strongly suggest a phishing or malicious redirection attack pattern.

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
  • 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.
  • 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.
  • 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=psychology+david+myers+10th+edition+study+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_5f998adea7439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462727/normal_5fa77e0538d52.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/e71d5b95e089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380223/normal_5fac619226ecf.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/sodokazid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393370/normal_5fab6faf1d97c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_5fb4166e9027d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_5f9a07844e46d.pdfIn PDF document text
    • https://penarira.weebly.com/uploads/1/3/4/7/134742142/wibagodorod.pdfIn PDF document text
    • https://vesekukoluvili.weebly.com/uploads/1/3/4/7/134759730/zifonibos_gufelexe.pdfIn PDF document text
    • https://razisosip.weebly.com/uploads/1/3/0/7/130739291/suxivuxofaxela_ramexit_relaj.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/kotenu/zobusutajogunigijo.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/silvio_rodriguez_cancionero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/babb6a6d-b0ff-4626-9cd7-5f957905a3b8/mobdro_apk_download_on_firestick.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_off0000bb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB49 5708 bytes
SHA-256: 894354ccf0bbebfdc039d38ab5b897b88247745061fb6b5637f829e3a8f0a6e7
font_01_sfnt_off0000ce9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9C 10336 bytes
SHA-256: e2b2e7d8210f68dd1608d2039416eb03a21541e81ba9e1dd8e5d4ec144f9aa7b

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