Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a648f43a1f0681…

MALICIOUS

PDF

71.5 KB Created: 2021-03-18 20:42:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c90c8bf18d900435e1d0333e9be07532 SHA-1: 2d8b34c1750ef668e6d9ccde4d7c5650186f204e SHA-256: 54a648f43a1f0681ad4b7a03ed00321866ac52b0f234322be7be4a9b2816bd17
214 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to link farms and redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL leads to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains strings that appear to be related to worksheets, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=fact+family+worksheets+for+3rd+grade In PDF document text
    • https://somokowu.weebly.com/uploads/1/3/1/3/131383604/2129345.pdfIn PDF document text
    • https://semetipakes.weebly.com/uploads/1/3/0/7/130775831/7417268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452376/normal_6022bc58bf1b7.pdfIn PDF document text
    • http://derikibavuji.22web.org/card_game_solitaire_free.pdfIn PDF document text
    • http://lukofaduxaxa.22web.org/dusebowanevadanozawafaxun.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/33d536e.pdfIn PDF document text
    • https://pepagefowajuna.weebly.com/uploads/1/3/4/7/134738543/b700a05cc.pdfIn PDF document text
    • http://gafaneripebenu.iblogger.org/bazozijoxidadujuw.pdfIn PDF document text
    • http://texewofe.22web.org/aadhar_card_making_software.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/452e58508993.pdfIn PDF document text
    • https://sepetumeba.weebly.com/uploads/1/3/4/6/134601334/f9ebef0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408701/normal_603e40438e94c.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/9428152.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xuzed/59748085109.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/wagner_flexio_590_lowes.pdfIn PDF document text
    • http://barabita.rf.gd/fakiberosekid.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/usg_guided_sciatic_nerve_block.pdfIn PDF document text
    • http://magomigubilo.rf.gd/les_mis_gavroche_song_lyrics.pdfIn PDF document text
    • http://bozojugejev.epizy.com/aiag_manuals.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/98535875399.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/matlab_plot_title_underscore.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_off0000d6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B9 5812 bytes
SHA-256: ae6801bdbd9261162a67bc364171cb880081ee4e6f8e028e75b12d8f195bcf27
font_01_sfnt_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 10732 bytes
SHA-256: fab64730b27f2c99cbe609e03996b2b9fd9b6d359267d5704ab745c16c0bf364

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