Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e49e641ed781fd…

MALICIOUS

PDF

67.1 KB Created: 2020-11-27 12:50:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 82bf3511fda64979d0f000413b829d30 SHA-1: 9d53aed7897e56a5b2d356055c463e3358ac4e1f SHA-256: 36e49e641ed781fda555e8fe0b254110681e8f76c565b106fcb596c786a6bf19
184 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to known malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary malicious URL identified is 'https://gettraff.ru/strik?utm_term=locus+scoring+sheet', which is likely part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://gettraff.ru/strik?utm_term=locus+scoring+sheet In PDF document text
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/8e9448c9d4b87c8.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/vusivivesap-newevagubiduvug.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/metor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f94a41a0ce60.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/masikirefaxafenasis.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/5e8d256f2b.pdfIn PDF document text
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/xabuxeremulaf.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/acfa27bc-2c64-4684-a05d-3f26edc4e3ea/39461638639.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/54230652429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30401cec-ba9c-424b-84ac-0adb27d664d3/modern_control_engineering_fifth_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6db64d-407f-4dd9-946b-f917a0c7c83a/new_jersey_jobs_indeed.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/units_of_measurement_for_salinity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de086da9-9ba5-4d48-90fd-8b6ef1cec61f/35921090072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53baacd5-26db-4a3a-9816-1c444bfbd08d/nozuvawonugejuredu.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_off0000cd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6D 4760 bytes
SHA-256: 6681239c32a18fc7714c24a1c5aa6524ebb83ee33a3ca24ead5a677872a906c2
font_01_sfnt_off0000dda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA1 10212 bytes
SHA-256: 1d90669b41f24f35c3228bd2155bf03538b03c2bcd938d97ba9485dd60d15c56

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