Malicious PDF — malware analysis report

Static analysis result for SHA-256 435d6773553b9743…

MALICIOUS

PDF

79.5 KB Created: 2021-03-07 12:07:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c76f1609851b6a56ab241c8566915fdf SHA-1: 3738083f11c471dc13cd58b2e04cc1024f9c2f5e SHA-256: 435d6773553b974353ca5a950729aac1bb21958a63cf7070c0bec3a0ed50b474
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or unknown reputation sites, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an attempt to direct users to potentially harmful content.

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
  • 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://xezojetit.ru/wix?keyword=aquinas+love+definition PDF link annotation
    • https://cdn.sqhk.co/lewiwifo/ogiBphd/zebaturupurawev.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/ahcIicC/kawaluboxibatig.pdfIn PDF document text
    • https://tuxufinuzeleki.weebly.com/uploads/1/3/4/7/134737217/b6d276d410723.pdfIn PDF document text
    • http://uscarinsurance.info/slack_api_formatting_messagesasxiw.pdfIn PDF document text
    • http://kwini-fini.online/link_to_the_past_heart_locations9kpbo.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/ujiyzhf/basketball_black_friday_sales_walmart.pdfIn PDF document text
    • http://zelopaqq.xyz/gavafugiwetapubaritukia70dz.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/cZ1Yiet/32337574833.pdfIn PDF document text
    • https://molilavavabofu.weebly.com/uploads/1/3/5/9/135989114/mazezagewoluva.pdfIn PDF document text
    • https://likufuzojelawaf.weebly.com/uploads/1/3/5/2/135298946/3355d21cc76306d.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/jimugivos/riwuzemimixet.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/arsenal_vs_man_united_highlights.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/43860740069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c95953-bff3-402c-bb75-a9de61d6ed61/be_the_center_of_your_own_universe.pdfIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_46bf345fa0794d77b4473b7e2597e954.pdf?index=trueIn PDF document text
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_f89f9ac2879e440b9b3b285060b40a3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3d6838-7e9c-4cac-b1df-4fb903a7ef8d/45585397815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91206308-2a21-461d-a5c7-b6e3b94e1cc9/gevevuxofonugew.pdfIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_4932acea12a14abdb5ae064405b2ff71.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/dokapawivalid.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_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 4980 bytes
SHA-256: a39cec42e7a77d873ba93a6503c8a819b582e07aec7a0f10082487c99de1ad30
font_01_sfnt_off0000f7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DD 10276 bytes
SHA-256: b3f83589c1c0b50a4168d8330309f880aefd8489ac589e14e72ef0eba9c2de8e
font_02_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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