Malicious PDF — malware analysis report

Static analysis result for SHA-256 661b53c61541838b…

MALICIOUS

PDF

84.4 KB Created: 2021-04-29 11:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bb391ba6cdba52af545efeece29eceb6 SHA-1: 299f01ac26388c9df9b2b4c3eaf3c04ba0eb0f88 SHA-256: 661b53c61541838b2be8ed78b553c10cad7d49f5a1b7fd21603d77b4f99bdc68
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the primary external links, https://mezovuduw.ru/strik, is likely malicious. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://mezovuduw.ru/strik?utm_term=forma+de+comunicacion+de+los+perros PDF link annotation
    • http://jekeluxuto.mywebcommunity.org/how_to_draw_a_cat_in_a_box.pdfIn PDF document text
    • http://gajelifuluxapov.mywebcommunity.org/bocio_tiroideo.pdfIn PDF document text
    • http://vozajomaralamer.mygamesonline.org/70326107675.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/sovizuvigaz.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/jeqhhh7/57792474357.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/xujupidijulavobex.pdfIn PDF document text
    • http://zexitekaxob.mypressonline.com/95731829668.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/97722592983.pdfIn PDF document text
    • https://cdn.sqhk.co/jimatoju/ibvcmbM/87106265404.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/lorugipopuxe/mazaziwosixojakukenukuw.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/pipeviguviwakokizi.pdfIn PDF document text
    • http://nozozuwovore.atwebpages.com/wubijotigobidedupuzigo.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_2c8086b7eec1434abf6c4e11a7428104.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/combat_training_guide_osrs_f2p.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/nordictrack_commercial_1750_price_south_africa.pdfIn PDF document text
    • http://kalasoziluxolim.myartsonline.com/applebee_s_menu_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/wordpress_administrator_login_url.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_c26d1c60daca466fbc5111d153ccca62.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/navy_eval_instruction_1610.10c.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/imperatives_esl_worksheet.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_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 5176 bytes
SHA-256: 2763e740b65261a12bc740d124eecb624b3c975463b3b4b30aa4b97947deac8a
font_01_sfnt_off000106a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 12228 bytes
SHA-256: 26175155bd962aee7cc059d7ae2f1e91611e5988aff9c0d5e87b0ae15666dc7a
font_02_sfnt_off00012e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E07 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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