Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ac179353eb94cd…

MALICIOUS

PDF

78.9 KB Created: 2021-03-11 16:33:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 52d896011bedffce908101f7e7308d59 SHA-1: b8e451d500cadc978c4b3916ed6261faf2eb7769 SHA-256: 42ac179353eb94cd37387e3b82ae944970505b93eb0e60ff09141b6c88c9625a
244 Risk Score

Malware Insights

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

This PDF document is classified as malicious, containing numerous embedded links that point to external websites. Several heuristics indicate it functions as a link farm, with some links directing to known malicious redirector infrastructure. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but no executable scripts were found.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://crophysi.ru/award?keyword=the+ethnic+cleansing+of+palestine+pdf In PDF document text
    • http://brumbum3.xyz/85609357291xe1wl.pdfIn PDF document text
    • https://wixinuwexe.weebly.com/uploads/1/3/0/7/130739185/e71e1df8a50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377697/normal_6030849e6ab09.pdfIn PDF document text
    • http://devgame.design/142369281464ruh6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416666/normal_5fec7c5d3bd91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416671/normal_6037b8180490a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_6010fc7f5098b.pdfIn PDF document text
    • http://gixodugesu.medianewsonline.com/deh-150mp_pioneer_manual.pdfIn PDF document text
    • http://salonapp.xyz/496928133192xc3.pdfIn PDF document text
    • https://mikatafa.weebly.com/uploads/1/3/1/3/131398449/53f75bf5e06.pdfIn PDF document text
    • https://rejaduwewuwuga.weebly.com/uploads/1/3/1/8/131856140/f194a5f0fac2a4.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeforms.com/vuvuzizufajeranaselesearrqg.pdfIn PDF document text
    • https://wokogosomexar.weebly.com/uploads/1/3/5/3/135322546/4598200.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/gomigozejudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486374/normal_6014206a1c087.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/582a9d47-2237-4d91-9df5-1a9c3a7dca1f/nuwexalepelexiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a37c91-7553-417f-a7a7-80e5403ce250/kumolexatik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57605c9d-21f2-4f03-9837-160e57f5642c/1783375001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9631d274-eaf8-4b7a-a9d9-e78a224a6cf3/76823130354.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/zajulebavisufimuranis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/253a054e-0fa7-4655-ba91-03561c297b5a/26115013154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f79358f8-f8ce-4051-b227-2e9ea2f9f4b6/cnet_best_cheap_printer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/722d9ab9-3f9f-42fb-ae88-59afe57860c1/what_does_sun_symbolize_in_the_bible.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/how_do_you_calculate_energy_efficiency_ratio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d57d31ad-b99d-4507-9fa9-ec6254142423/true_colors_assessment_results.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e922e28-7a5c-4c5d-bc0f-ba9ce7b745dd/bose_remote_control_code_for_samsung.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc55ba23-fc2e-47fd-a0fc-892cb50f2a71/how_to_clean_the_dyson_v6_animal_filter.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_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 5268 bytes
SHA-256: faf86f94cdcb803cfad3e7ee2d797f3d130963b112be9ab387ed67b10df98e76
font_01_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 10440 bytes
SHA-256: 0dc0447f9cde8f0a63dcb689b0b4204764b8db5e85a1729f07d650ae52e7a465