Malicious PDF — malware analysis report

Static analysis result for SHA-256 d655b88e595a75d3…

MALICIOUS

PDF

119.4 KB Created: 2021-03-20 17:06:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4654d5350cce289a7652ee93dee58c65 SHA-1: c70ff0936a53599c1de2e451d3186487d238cb55 SHA-256: d655b88e595a75d332075cb78228e6ba63f56e542fc6caff5e75cccc52718bc6
186 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/wix?keyword=smc+flex+150+manual+espa%25C3%25B1ol PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475375/normal_5fe720e7b1b44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419847/normal_5fe881f4cc92c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402501/normal_5feb79056ebb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416938/normal_603749b23f501.pdfIn PDF document text
    • https://tezubowaxax.weebly.com/uploads/1/3/4/6/134640868/8497165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_600f160608fee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502906/normal_5fef6b0add4f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368501/normal_5feb51396eb20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408595/normal_5ff5febf1ab4a.pdfIn PDF document text
    • http://setixin.iblogger.org/mindtap_microeconomics_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_603bef32bff68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474977/normal_603e5df29f715.pdfIn PDF document text
    • https://tujezagen.weebly.com/uploads/1/3/4/7/134775207/72f0df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458161/normal_5feff4c9765ee.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/temekakos-petibepikibu.pdfIn PDF document text
    • https://wabaxudazisivi.weebly.com/uploads/1/3/3/9/133986682/f3ab7847dcb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485704/normal_6033722a0cfec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371791/normal_6009871679ebe.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/1d21d057-b595-473d-9d6a-51fe8e897a4c/50920594320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a6c2bb-3d96-4423-b97b-4e50f1d50c83/mirro_8_quart_pressure_cooker_parts.pdfIn PDF document text
    • http://puretuwedeva.epizy.com/22864578836.pdfIn PDF document text
    • http://wuvesuwenelagaj.rf.gd/bhangi_de_odia_song.pdfIn PDF document text
    • http://viwukapatajomi.rf.gd/kl_gangster_1_full_movie_free.pdfIn PDF document text
    • http://zifokorakimedak.rf.gd/metal_gear_solid_1_guide_book.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17974 5768 bytes
SHA-256: 2a9d11dd866629385878d387f69668d5e74a4de2569ae1a38a4040cc04d386ff
font_01_sfnt_off00018cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CD6 12172 bytes
SHA-256: 01d4ce102f081ac674b4b284b0902f628376566f81e32c2d8b2f88aec3156629
font_02_sfnt_off0001b627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B627 17200 bytes
SHA-256: 2e2fb8d2ec8fd2a4cb82eca387863edee422c9e571a1c0e9f413faec51e64cfa