Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd6d53ab60da6bc…

MALICIOUS

PDF

77.1 KB Created: 2021-06-04 02:40:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 70d88d5d727400357b2c243e653f23ee SHA-1: b59cd45d506520fb0b5533606cbed897dfcb1ab5 SHA-256: 7dd6d53ab60da6bc77d8ba66239dcd22b2f771a3d5521871ff3b132e88069d6b
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs is https://mezovuduw.ru/123?utm_term=application+software++for+android, which is likely used to redirect users to malicious or unwanted content. No scripts were extracted, but the PDF structure and numerous external links indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/123?utm_term=application+software++for+android PDF link annotation
    • https://jotopivazujofid.weebly.com/uploads/1/3/4/8/134881135/3832463.pdfIn PDF document text
    • https://xigobelez.weebly.com/uploads/1/3/1/6/131606473/lijunizodexakiw-mikilaz-juvirizasuzinu-timibere.pdfIn PDF document text
    • https://gegaminowudajun.weebly.com/uploads/1/3/4/0/134041134/5232315.pdfIn PDF document text
    • https://jetebudatupa.weebly.com/uploads/1/3/4/7/134748577/gusevudesugejutepage.pdfIn PDF document text
    • https://guvikaki.weebly.com/uploads/1/3/4/5/134519546/d347600edc81f9a.pdfIn PDF document text
    • https://jawutasujo.weebly.com/uploads/1/3/0/9/130969833/tarobaleripiga.pdfIn PDF document text
    • https://fekolulowezomo.weebly.com/uploads/1/3/4/5/134593542/ec45a54fc6c.pdfIn PDF document text
    • https://dijavagom.weebly.com/uploads/1/3/5/3/135325372/4685862.pdfIn PDF document text
    • https://nodigikoj.weebly.com/uploads/1/3/4/3/134384892/ec2f35.pdfIn PDF document text
    • https://nugekowu.weebly.com/uploads/1/3/4/5/134587082/voxixu_temoj_duxefataba_mebiva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144424719/zutabibatibifunezaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7af282b-8091-4ded-9f8b-ba09d22b5eaa/how_much_is_42_inch_plasma_tv.pdfIn PDF document text
    • http://vazesuna.pbworks.com/w/file/fetch/144518505/2180071563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cecff738-7692-45a2-827e-adc6c7a1d1c1/ginejewekuje.pdfIn PDF document text
    • http://risuxujuvu.pbworks.com/f/vanadeziralisatutafizozo.pdfIn PDF document text
    • http://tazijebep.pbworks.com/w/file/fetch/144561825/ruvus.pdfIn PDF document text
    • http://papoxuva.pbworks.com/f/nivubis.pdfIn PDF document text
    • http://sejiliki.pbworks.com/w/file/fetch/144542136/dinorudoxibowuripozibi.pdfIn PDF document text
    • http://zafasuvolo.pbworks.com/w/file/fetch/144543786/zesezazefipisonokupineda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/627985ee-b6df-4728-90df-77eba6dbf768/fixexunilimiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a5993a8-97a5-4da7-88e9-05ddf0e0ad48/on_shooting_an_elephant_quiz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 5016 bytes
SHA-256: 67616191a30c44ad9a5bc0ccd6abbf75fc5a7372bc6f064f4cbb4a8dcedaad96
font_01_sfnt_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 10168 bytes
SHA-256: be7d413088737ea05f360315dd46a041b5d990ec3caf6c99cedc66d4501a4687
font_02_sfnt_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361