Malicious PDF — malware analysis report

Static analysis result for SHA-256 f250be523a91b1c8…

MALICIOUS

PDF

85.8 KB Created: 2021-03-20 10:10:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dd63084e69e3595800532d6f202d213a SHA-1: 5a0b4d4ea91233f819c781a11b9ffc90ad66beef SHA-256: f250be523a91b1c86f0e86e43e7a311bc0d78f88940c73a4474b88b0343a1cab
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/wix?keyword=microsoft+access+2010+tutorial+pdf PDF link annotation
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/1682900.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_60143fea4b6c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453328/normal_60466f6512877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417653/normal_5fe0d6e4f0251.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_602bf73cf14fd.pdfIn PDF document text
    • http://mubarominufu.iblogger.org/diwetowulax.pdfIn PDF document text
    • https://tedamitaza.weebly.com/uploads/1/3/0/7/130740371/revusefabapov_tutezokap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377704/normal_5fc828783062c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406516/normal_604a89dc818b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368494/normal_5fca87fb635fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455645/normal_5fde6d55c95c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_6020b325e023e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/novipaliwid/83217364933.pdfIn PDF document text
    • http://lokokojorivumi.rf.gd/alphabet_letters_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/sewegowesodenumofebavef.pdfIn PDF document text
    • http://bijasubibivov.rf.gd/2015_jeep_cherokee_parts_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/where_i_can_donate_toys_near_me.pdfIn PDF document text
    • http://zipituvopedisi.rf.gd/weather_report_today_amritsar.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/60162044031.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/duliajan_weather_report.pdfIn PDF document text
    • http://vuvazapej.rf.gd/fusion_gratuit_telecharger.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/dafokuzonimaru.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/dr_heideggers_experiment_short_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/after_twenty_years_class_7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 5256 bytes
SHA-256: d6e1124165673cb875363b7908030fa8e572b1a3e367c107a32277291df0f6fb
font_01_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 11156 bytes
SHA-256: 4179a1c4261b7cfb46e0c044439500aa25d362573fabdb96fff9fa8fceb83bee
font_02_sfnt_off00013b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B53 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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