Malicious PDF — malware analysis report

Static analysis result for SHA-256 da95387bac8e679d…

MALICIOUS

PDF

102.0 KB Created: 2021-01-19 16:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 85d7c2c6d86d94bd7cc29b9918abf11a SHA-1: e10a0cc86ac2f8185120f5f88eb58db707d19ab0 SHA-256: da95387bac8e679dc686853ee4eb8edabb089e8d9b382fc5bc71c68f137bd948
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm attack. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The primary IOC is the external URL found in the document body, which likely leads to the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://bologen.ru/aws?utm_term=non+abelian+group+pdf PDF link annotation
    • https://site-1172119.mozfiles.com/files/1172119/general_warranty_deed_form_missouri.pdfIn PDF document text
    • https://gubaxefu.weebly.com/uploads/1/3/4/5/134592394/2698872.pdfIn PDF document text
    • https://site-1210550.mozfiles.com/files/1210550/risewupikokunerovukar.pdfIn PDF document text
    • https://site-1178138.mozfiles.com/files/1178138/javascript_code_cheat_sheet.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/8767144.pdfIn PDF document text
    • https://site-1168192.mozfiles.com/files/1168192/big_headed_crossword_answer.pdfIn PDF document text
    • https://site-1212478.mozfiles.com/files/1212478/jufukaradudakakevimubixas.pdfIn PDF document text
    • https://site-1176958.mozfiles.com/files/1176958/head_ball_soccer_2.pdfIn PDF document text
    • https://rominekajamarol.weebly.com/uploads/1/3/4/0/134040464/pibilexekolinitivi.pdfIn PDF document text
    • https://site-1223444.mozfiles.com/files/1223444/visual_studio_code_formatting_php.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/polexebuj/gaige_guide_borderlands_2.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/wedding_guest_list_address_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/8th_grade_georgia_studies_textbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tosasugokod/super_metroid_brinstar_secrets.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/csf_full_form_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/albania_passport_number_format.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/angular_4_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/bafebitedozi.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/39538624016.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/android_graphic_design_app.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/konobomot.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/jofasobipiwefum.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/23779116514.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_off000136b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B3 5140 bytes
SHA-256: 44fcdd6078d69ec2f1b6c0d8eb0d23a03af004e913c20e102bc6323593bd77b1
font_01_sfnt_off0001483f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483F 12608 bytes
SHA-256: 1c68cb6cc54abefed174e3ce363324bc6b8594e13904420d0c1e8eca8a38be3d
font_02_sfnt_off0001725b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1725B 16848 bytes
SHA-256: eb1bb16728d3fd3a3bda4fea3a223888f9b1e494cf3e6297cbf862495165a2e8

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