Malicious PDF — malware analysis report

Static analysis result for SHA-256 699a8306908619c5…

MALICIOUS

PDF

73.3 KB Created: 2021-01-27 06:22:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 194bfa521c715fe1d6a04c57cd6bb53a SHA-1: e338b7b97086dd0a4a8c0526b141eeb8a2c50ee0 SHA-256: 699a8306908619c56bb8a245939f3390991f21a1a239db8dedec88db83196e88
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a link farm and a ClamAV detection for a phishing trojan. The document body, though heavily obfuscated, contains text related to 'sight word worksheet free', suggesting a lure. The PDF contains numerous external URIs, with a significant number pointing to Weebly-hosted PDFs, indicating a potential distribution network. The ML classifier output of 0.999502 further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/123?utm_term=we+sight+word+worksheet+free PDF link annotation
    • https://sowurudiz.weebly.com/uploads/1/3/1/4/131438308/muwiminugufum-xijegamitidupe-tidopowixixitot.pdfIn PDF document text
    • https://jejaxeka.weebly.com/uploads/1/3/0/7/130739175/8599264.pdfIn PDF document text
    • https://ketizinuxemuwiw.weebly.com/uploads/1/3/0/9/130969628/nexakar.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/manuwogarute.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/197d63.pdfIn PDF document text
    • https://dakogepakidi.weebly.com/uploads/1/3/5/3/135391125/9c17aef9313929b.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/tuxutedi/rudukolegudonep.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/a_level_maths_mechanics_notes.pdfIn PDF document text
    • http://bovinow.epizy.com/38691951410.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/3810101375.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/moorish_idol_care_guide.pdfIn PDF document text
    • http://xanomake.epizy.com/caravaning_informations_gmbh_frankfurt.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/grade_5_lines_of_symmetry_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/17271609822.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/gibuzukudovizonok.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/9025636069.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/47962151968.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/brookfield_infant_school_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/digital_painting_brush_photoshop_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/21767543708.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/angry_mom_ep_15_eng_sub.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/vibawojodi.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_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 4776 bytes
SHA-256: 6587cb6b7a1a90b1af7b1fc318407da2c0ec138bae9220770509ce4a0e3f9da5
font_01_sfnt_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 10544 bytes
SHA-256: 4e12b2747dfb8f27e876dc1b5ee6168a34507ebafd6ab47962e7b8d7bc8021bb
font_02_sfnt_off00010978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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