Malicious PDF — malware analysis report

Static analysis result for SHA-256 541ed145f529199b…

MALICIOUS

PDF

73.1 KB Created: 2021-04-04 16:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dc240597bd30f300e7792ecde5c7d58c SHA-1: 261807f082499cf1f5524e687eb4e4b28ddff82f SHA-256: 541ed145f529199b2e973bbc0ce8127355e61a203f8a6312ba472e378007625b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=bahaya+asap+rokok+bagi+ibu+hamil+pdf PDF link annotation
    • http://oblakova.ru/27148002890n52fs.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/cgdgdio/earth_asteroid_collision_simulation.pdfIn PDF document text
    • https://cdn.sqhk.co/woguwubege/jgjeih6/93026037382.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/uwggg6c/69767675867.pdfIn PDF document text
    • http://uplrezina.site/bet9ja_soccer_football_predictiont9riw.pdfIn PDF document text
    • https://cdn.sqhk.co/suwuwewazaka/ehgVN2B/69447516969.pdfIn PDF document text
    • https://cdn.sqhk.co/ponatabet/3Ihdogh/walking_dead_season_10_finale_full_episode.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/E2hjCjg/cartoon_voice_ringtone_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xororasomig/eji2jeE/bosufuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464524/normal_602e07c3c95a4.pdfIn PDF document text
    • https://cdn.sqhk.co/roweziwamu/fYyqCib/34863467496.pdfIn PDF document text
    • http://gnfcns.info/92817875066qde6x.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://merishwheelrecords.com/evenflo_chase_select_lx_installation_videozaga4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450042/normal_602c8c646c164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471467/normal_600b1d3ea7f96.pdfIn PDF document text
    • http://baby-slings.ru/933722532686sqn4.pdfIn PDF document text
    • http://nextauto02.ru/7915597369aclv9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_0df739a01b614f23a7c810dc175e6f6a.pdf?index=trueIn PDF document text
    • https://be9c8297-50e9-4ec8-be22-7cc4068ef96a.filesusr.com/ugd/fc3b0b_3304b457a16d4e05bd5c0fb3924e1b8c.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_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 5808 bytes
SHA-256: 0dbfd9bcecd09106078ce455123c1040c4931fb7b11561f7de35d3fabcd811a9
font_01_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 10220 bytes
SHA-256: f6d3d942c90e1ebfae356fea4de427dba13d067ad6daea1e0ad4d6f0f1eecb2b

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