Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c9d744430891eb…

MALICIOUS

PDF

75.9 KB Created: 2021-02-28 20:05:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 27f69d20521cd1ecbcb67688d09953b2 SHA-1: f2ffdc18ff7b8fffa285cdca5f8978acd10a30d9 SHA-256: b7c9d744430891ebfbeade81fa44c6db26faf526608f5f95853c97425560a8ed
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic identifying it as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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://maypoin.ru/strik?utm_term=hp+photosmart+5520+black+cartridge+not+working PDF link annotation
    • https://givozerav.weebly.com/uploads/1/3/2/7/132710596/d2d1e8b4cce7.pdfIn PDF document text
    • http://pifavobiju.iblogger.org/the_story_of_ruby_bridges_by_robert_coles.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410989/normal_5ff394ff6b583.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/gd3NdRd/football_training_gear.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/cf81378e748b1.pdfIn PDF document text
    • http://zuzudijibogojag.22web.org/android_phones_under_5000_to_6000.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/vizio_e40-c2_universal_remote_code.pdfIn PDF document text
    • https://kigijogi.weebly.com/uploads/1/3/4/7/134702755/600013.pdfIn PDF document text
    • https://vesevowix.weebly.com/uploads/1/3/3/9/133987154/fasexikuseni_sosopurilipi_refig.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/57408579397.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446944/normal_6000adce78c5b.pdfIn PDF document text
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/6041005.pdfIn PDF document text
    • http://dedezitomurepu.iblogger.org/29533047673.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giwaseluje.rf.gd/xeditupuwimunomin.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/cooking_academy_free_full_version_unlimited.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/pupakejojixovefigusotava.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/fuzitukufufajotixixo.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/ek_bar_aaja_raja_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/rational_algebraic_expressions_worksheet_with_answers.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_off0000e7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 6144 bytes
SHA-256: 025e7b16645cb9b703a691f69ceef304df2bbf948ed0b7116ff6742466032299
font_01_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 11168 bytes
SHA-256: 59d54620dd99c0de5d968e725ddb08e5bd64f78485279ea2943360c71fcb8b03

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