Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9effe5fdba07d8…

MALICIOUS

PDF

90.2 KB Created: 2021-03-17 03:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 028f68b659a8ee76e0539cffa81ff2ff SHA-1: 9e2ad0d4a03b28e71cee13254af962db177bb3f8 SHA-256: cf9effe5fdba07d81ce9c56627e04edc6d61b01917bc18f2a508e1edfc510aa6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to benign-looking PDF files, suggesting a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious URL redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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://zajinet.ru/123?utm_term=brand+positioning+strategies+for+competitive+advantage+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384647/normal_60061078e358f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443812/normal_5ff34637be568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468836/normal_6026b944be107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427274/normal_6051495fcd61d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_e28fae1f75c24f8aa69cd94d3cad8e4b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zonivezada/milwaukee_dnr_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/rukavolajajiru.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/9328326185.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/zifofuxiwogurugiru.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/chess_openings_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/w_o_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/sitofunokezaxeluwo.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/zixeruvemegopatu.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/creative_coffee_table_book.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/portable_basketball_hoop_installation.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/40198586015.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/lojuja.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/jigawe.pdfIn PDF document text
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_e38eb34bd3e34918aaf0627c4eaa5d34.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/juwuwonon.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/refejilosugosakire.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_b204a0805d0b4bc2a9ff4e94a59aa46b.pdf?index=trueIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_6a46c528a80541d5b156b9d3938bac72.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
    • 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_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 5552 bytes
SHA-256: 28b3f60a1eed7cd90452cab860ef01213b17dd28d3de2186314fbcfa76307ac6
font_01_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 10892 bytes
SHA-256: 526f942b7952b2437af260cf2b03b5bb4818405ce1ffab00c51275f3ccb67ebd
font_02_sfnt_off00014550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14550 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

Open this report in the interactive analyzer, or submit your own file for analysis.