Malicious PDF — malware analysis report

Static analysis result for SHA-256 e255b4c366738346…

MALICIOUS

PDF

75.6 KB Created: 2021-02-12 11:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fbc8c28ff4d9ba07d0dfda2cd47a38ad SHA-1: 1fe9f5472233b560122678e01aed7918219a24db SHA-256: e255b4c3667383469f3fac9f9612305d725ca9b8142c1fcb9dd334a867042262
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, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://jottigo.ru/wix?keyword=yamaha+motif+rack+es+manual+espa%25C3%25B1ol PDF link annotation
    • http://promooffer.site/dsm_5_espaolj66cm.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/hhibhjG/19956996117.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/kokia_fukurou_sheet_music58qc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495395/normal_5ff71c553bf11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410020/normal_5fdfbb12651cd.pdfIn PDF document text
    • https://cdn.sqhk.co/kujusiru/uhjgczS/walesi_fiji_contact_details.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393019/normal_6000c360e254e.pdfIn PDF document text
    • https://zizeximafebofiz.weebly.com/uploads/1/3/4/3/134369397/5989092.pdfIn PDF document text
    • http://goodsun.fun/constitution_scavenger_hunt_answer_key_ap_government4quuh.pdfIn PDF document text
    • http://kartaidatodemeleri.com/gitutezisizimanofi88ex0.pdfIn PDF document text
    • https://cdn.sqhk.co/fujikapoji/OAfCjff/special_rambo_game_download_apk.pdfIn PDF document text
    • http://idealsit.fun/pipajerafamedakigigimodfh2mb.pdfIn PDF document text
    • https://cdn.sqhk.co/wanuvudeb/fZhhXgd/classic_craft_design_online.pdfIn PDF document text
    • http://paganel.world/el_reino_de_este_mundo0pl4a.pdfIn PDF document text
    • https://cdn.sqhk.co/jowowibow/9hiihij/plant_vs_animal_cells_chart.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuxexulotubi.epizy.com/vavomanaxufonejisirizuku.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_off0000d446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD446 5492 bytes
SHA-256: f82b51084254ee85c862bb46daf29d73008f4e2a0e9d884d24ad1a4ea769d2a9
font_01_sfnt_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 10364 bytes
SHA-256: e413a41795694d64a0d0c7aa48bfb49f6a2f0711a2202f7f3f0a53b290bf2dcb
font_02_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 16084 bytes
SHA-256: a56dd6e3cfa148c92ed5f3142193374b407f6958f728d0c91ff19ef246bd70d4

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