Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b323b68f3d0f58…

MALICIOUS

PDF

131.6 KB Created: 2021-03-28 09:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 22587f1c3974b2eaaed6025ad9d4866e SHA-1: 965d55b77c6e61d5561b706ab5cf586f97024150 SHA-256: 34b323b68f3d0f58f53402a0ea067efe305aaf5e7ad052c415c6a3f9ada73aaf
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and hosted on services commonly used for link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or ad fraud. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/wix?keyword=fire+emblem+fates+action+replay+codes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4443824/normal_6004acb69e3aa.pdfIn PDF document text
    • https://cdn.sqhk.co/vetedaxuzele/iehcjgd/kilelukevexolodiz.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/hrPijgd/23471618345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367019/normal_600e015083886.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/kN1nHHv/chess_for_pc_3d.pdfIn PDF document text
    • https://mefimume.weebly.com/uploads/1/3/1/4/131437875/meguwofojojit.pdfIn PDF document text
    • https://cdn.sqhk.co/vikafaselida/aNXjfM0/fgdp_guidelines_dementia.pdfIn PDF document text
    • https://nazoturifebigik.weebly.com/uploads/1/3/1/6/131606271/xanonevasazedodi.pdfIn PDF document text
    • http://rezltml.xyz/vatibivorilifixakerbtml.pdfIn PDF document text
    • http://salestore.pro/picard_star_trek_movies_in_orderw99s2.pdfIn PDF document text
    • http://rentline.pro/sapobomovatejapatewikedgq55.pdfIn PDF document text
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/kugis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479214/normal_5ffaf0baf0f06.pdfIn PDF document text
    • https://cdn.sqhk.co/jesuzedavoti/XfIgduh/talot.pdfIn PDF document text
    • http://vodoroding.info/what_are_the_four_intermolecular_forcesh8wwg.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/7e200efa-205c-41a6-957e-466cb9868bbe/xuvurelefofiw.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/65132854991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a16bf78-3a2e-4a91-a30f-20c1f431b6e1/36711130383.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/pufufopozonelolif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79eec2aa-3258-4912-9677-955ba3067634/hp_deskjet_3050a_j611_series_not_printing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39b81696-3922-49e6-a2b5-163e5473862e/sony_trinitron_tv_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/superficial_vein_thrombosis_treatment_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/472e13dc-917d-444e-808e-a6b9c5428d2f/86899099480.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/compound_word_worksheets_1st_grade.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB3F 5496 bytes
SHA-256: a9799717d791f13adc63a0284c7561f2fcde5010489e59ccf2fb49e377af42da
font_01_sfnt_off0001dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDDB 10120 bytes
SHA-256: ba3d56321e55ced5c1e8334b4dc134be7f4a41e9854d9d3fe215dac4b540d631