Malicious PDF — malware analysis report

Static analysis result for SHA-256 a014bee5f0753141…

MALICIOUS

PDF

65.1 KB Created: 2021-01-21 23:50:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e043075b6332ecf328a58b4bf7808b74 SHA-1: 77962b2626a818728a4d7a6a6696039a7c4d73c1 SHA-256: a014bee5f0753141d970c0c39aca000a441aa2aed43bcaefc4457b9eb3885781
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm' heuristic, suggesting an attempt to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious intent, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/123?utm_term=latitude+and+longitude+worksheets+free PDF link annotation
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/bovinagi.pdfIn PDF document text
    • https://tabetigilazewa.weebly.com/uploads/1/3/5/3/135392987/598457.pdfIn PDF document text
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/7900556ef5a2c.pdfIn PDF document text
    • https://site-1178817.mozfiles.com/files/1178817/50820113085.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445564/normal_5fec9226caf61.pdfIn PDF document text
    • https://site-1176481.mozfiles.com/files/1176481/bssc_1st_inter_level_exam_answer_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447877/normal_5ff13ed54820a.pdfIn PDF document text
    • https://kuwugexikoxol.weebly.com/uploads/1/3/4/7/134718068/mojuko_zefaribuguvem_doputekore_rezug.pdfIn PDF document text
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/1c2b598681.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xibaxet.rf.gd/bioskop_xxi_film.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/padol.pdfIn PDF document text
    • http://mafonoxerinomif.epizy.com/census_data_us.pdfIn PDF document text
    • http://tarobajasupimi.epizy.com/auric_basin_achievement_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/homophone_worksheets_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/jadetusozo.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/sony_wi-_c300_manual.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_off0000c3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F8 5268 bytes
SHA-256: 24d842457a332a16c092685dc72619c84550a4bb0b33bb20bd94db6f5d34aed2
font_01_sfnt_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 9852 bytes
SHA-256: e50c94051f9e12a2fa275ee05ebc4141d1d48048d424d0284eaf02da7449758a

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