Malicious PDF — malware analysis report

Static analysis result for SHA-256 275c4d1061fa9ba1…

MALICIOUS

PDF

106.0 KB Created: 2021-03-19 12:42:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ea1bc1c709043e64f61f24c3e4bc24c7 SHA-1: 0e5f33d440f7258130327773610553f5543e87ad SHA-256: 275c4d1061fa9ba1b7eeb82c628c8ce2b0e5f92973c3440e73f956470699d587
186 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating it functions as a link farm. It contains numerous external URIs, including a primary malicious URL hosted on 'mezovuduw.ru' and a link farm pointing to various domains, some of which are hosted on disposable infrastructure. The PDF structure and embedded links suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://mezovuduw.ru/wix?keyword=great+plains+traditions PDF link annotation
    • http://reetodo.online/vuxomanozifuzepumonerevftfdj.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/gjmdlpQ/real_driving_school_sim_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fukaxaxod/itheghN/how-_to_guide_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/jfNCGG7/27119333460.pdfIn PDF document text
    • http://digitaloffice24.ru/brady_tls2200_manuale_italiano1qumg.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/nDiiXgc/hair_fashion_1980.pdfIn PDF document text
    • http://yazansoft.com/contabilidad_de_costos_definicion_autort3h5b.pdfIn PDF document text
    • http://inostrana.com/education_board_dhaka_result_sheet2tjeu.pdfIn PDF document text
    • http://parkji5x.xyz/kalagirituzuvag1vgtw.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuzasana/dXhejha/lodep.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/iAYOnjJ/13656848446.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/xezonijida/outlook_calendar_sync_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/54305756031.pdfIn PDF document text
    • https://488a161d-122f-4e25-b35e-34d1d0e27b34.filesusr.com/ugd/bbc910_a8e25c5ae6a74cf1bd28cf4892b8fdd4.pdf?index=trueIn PDF document text
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_5b1dad2c49784515b67611d037a8edbc.pdf?index=trueIn PDF document text
    • https://99b08629-27b2-41dd-83a1-938dc2ca35bd.filesusr.com/ugd/067ecb_4ef20186bdae49f291032422d09e97bf.pdf?index=trueIn 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_off000161d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D4 4984 bytes
SHA-256: bcd0e624c7cf57b86fdf28f751d6776b0b0c93c7635a13005d11a842ba0e417c
font_01_sfnt_off000172d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172D1 13208 bytes
SHA-256: dcc7ef14bdb3228b257e3f5ab161819605add8d50c4253c950a2e6ee2f0fe0f2

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