Malicious PDF — malware analysis report

Static analysis result for SHA-256 719ea47532eb4c0f…

MALICIOUS

PDF

67.9 KB Created: 2021-03-27 12:19:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b6ec19fade3a9fe3b283358ba632729a SHA-1: 2063ec70338e04df55374c5f1dd6361c2bf44c09 SHA-256: 719ea47532eb4c0fca0605f25bdb3569c8f9f98759387811f2ff62e51a77e7d8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing or a trojan. The embedded URLs are likely used to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=acids+bases+and+the+ph+scale+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/vakolitakap/VAgigjo/greatest_hits_queen_album_vinyl.pdfIn PDF document text
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/19f09eb2b64f.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/jdhfibO/lesson_plan_examples_for_esl_teachers.pdfIn PDF document text
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/jelukodabene.pdfIn PDF document text
    • https://cdn.sqhk.co/xoguvamev/DlJhjhf/xinuz.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/qdyjeGu/knock_me_down_song_download.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/xeruxaxer/3mm_aluminium_sheet_perth.pdfIn PDF document text
    • http://muwatuvefe.rf.gd/baseball_pig_ms.pdfIn PDF document text
    • http://vaguwiraji.rf.gd/48891067621.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/98940624735.pdfIn PDF document text
    • http://jubogaju.atwebpages.com/davis_vantage_vue_6250_review.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/kung_fu_tea_christmas.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/icse_10th_board_exam_2019_date_sheet.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/701333144.pdfIn PDF document text
    • http://dawejur.atwebpages.com/buvuvixexokadima.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/kufunusufabajerodogavofi.pdfIn PDF document text
    • http://wivifizurata.epizy.com/safarologonuvodataben.pdfIn PDF document text
    • http://kigokigaruv.myartsonline.com/pivubuzixusekakumunisof.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/how_to_learn_biochemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/rojeginagolezusufepu.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_off0000cb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4C 5548 bytes
SHA-256: 583adc2eeeb4ae63ab1cd11ce945080efe45e6bf866093f36ca67e982154ebc2
font_01_sfnt_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 10380 bytes
SHA-256: 665e082e772b41e86869ddeaf224886f1dfea485520bf6701e55ac3053cbe74a

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