Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8addfe38fd6fb39…

MALICIOUS

PDF

82.4 KB Created: 2021-03-20 06:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 746b3d4b89094b419440a0894b163439 SHA-1: 3a3ffb5596a8e345eedd2b2e250a19070b88f8d4 SHA-256: d8addfe38fd6fb391ff2a4c39bfd34edbbb932d4d6c48334a450c22b3dd7bdf8
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

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://bologen.ru/wix?keyword=cj%2527s+beach+house PDF link annotation
    • http://soldatskaya6.ru/7xcff.pdfIn PDF document text
    • http://nosinoski.shop/xijulazamolokef59o6g.pdfIn PDF document text
    • http://rcasino.info/error_code_0033_espnjz3l9.pdfIn PDF document text
    • http://magic-spring.com/43860070099eeaya.pdfIn PDF document text
    • http://yachtcharter.group/jitterbug_smartphone_for_seniors_reviews2oigl.pdfIn PDF document text
    • http://item-mask.top/what_are_adaptive_skills_in_autismgjxq0.pdfIn PDF document text
    • http://obmenkalnr.online/uptu_mba_entrance_exam_previous_year_question_papersclg3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460057/normal_5fdc35b6ec5ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384154/normal_603a50a5c2a84.pdfIn PDF document text
    • http://habirovradik.ru/ceridian_dayforce_app9wfeh.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaxirupunu/chgNAo5/62348711784.pdfIn PDF document text
    • https://cdn.sqhk.co/vunebegawiwa/ihid6hh/sakofebuzotirozorakukoxe.pdfIn PDF document text
    • http://sexedate69.site/straw_man_definition_financialrqvgu.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/fd647f18-cecf-4a45-9659-77b41eddfd6a/how_to_do_p90x_without_pull_up_bar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/070690c3-b9f7-4967-99de-08fb778a661d/what_does_covid-19_safety_plan_in_effect_mean.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_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 4916 bytes
SHA-256: c3a6e840ffced730bc5a59febcd62c4330b093aa8bbd5253d46a9dad62a10a4e
font_01_sfnt_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 11520 bytes
SHA-256: 959f70f8229d66166a3409d24911e9282f29eddc35cc9ad9ca7a3c381f5b1f13
font_02_sfnt_off000120c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 17696 bytes
SHA-256: 44dd3ae6ae2e4843b915c5ce17edc969bac8286a715963fc76ceca22bf73ae6f

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