Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e21e6f49fd445a…

MALICIOUS

PDF

73.7 KB Created: 2021-02-19 02:07:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 73d1dde675619a2c73d018d9203b7c56 SHA-1: d4d02942f7c18ecba51e450335c6d0dcce7708d4 SHA-256: 84e21e6f49fd445a72f52ff6d69292168179c7985d9a40079a606167eb2f4898
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, characteristic of a link farm, designed to direct users to various PDF documents. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm technique suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=assassin%2527s+creed+2+strategy+guide+pdf PDF link annotation
    • http://fruit-ita.fun/call_of_duty_4_zombies_ix_guide53tsd.pdfIn PDF document text
    • http://info-pages.ru/vivavifupesi2bdkn.pdfIn PDF document text
    • https://bemagage.weebly.com/uploads/1/3/4/5/134525224/e24d2bbbec.pdfIn PDF document text
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/luminepumolog-mavilo.pdfIn PDF document text
    • http://jobs-ingenieur.best/97171976411trurc.pdfIn PDF document text
    • https://putoluvutawubu.weebly.com/uploads/1/3/1/4/131437806/8f09c20d2656.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464056/normal_6001d1e02eb40.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/be931db9e223.pdfIn PDF document text
    • http://gowitobo.iblogger.org/assume_form_lyrics_traduction.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372378/normal_600900dc95d9c.pdfIn PDF document text
    • https://susatabunek.weebly.com/uploads/1/3/2/6/132695662/tejexorer.pdfIn PDF document text
    • http://videohost.space/89734722129w8az6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zufitarevegu.epizy.com/dobexobepenibemozisowa.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/free_cv_template_word_for_pharmacist.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/simple_past_and_present_perfect_exercises_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/9150418059.pdfIn PDF document text
    • http://sutuguve.rf.gd/daxulitatezim.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/82214401802.pdfIn PDF document text
    • http://peworesafasar.epizy.com/8137659594.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/free_printable_reading_comprehension_worksheets_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/angry_birds_2_apk_data.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/42470043246.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/autodesk_maya_2013_free_64_bit.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_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 5548 bytes
SHA-256: d616e50dd6966bd03ae92a67cfd2283abcdd048168ff137fba2d835685d2fe1e
font_01_sfnt_off0000f1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 12140 bytes
SHA-256: b846af628960b7698c90eee8b473d4d8a81d9a5ae1ea41db01ef0f25a4508364

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