Malicious PDF — malware analysis report

Static analysis result for SHA-256 530933a8ae09f953…

MALICIOUS

PDF

77.9 KB Created: 2021-02-12 17:19:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6beaa652ef2bf606fa52825b19499324 SHA-1: cf8421f7f8540399d8a482f18bb90d5bcaec7293 SHA-256: 530933a8ae09f953ce2804ccbf33d49c64292cb080e3e86d6ea97067216d7b56
234 Risk Score

Malware Insights

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

This PDF file contains a critical heuristic indicating it links to known malicious redirector infrastructure, specifically 'https://crophysi.ru/wix?keyword=unblocked+war+games+at+school'. The document body, though heavily obfuscated, suggests a lure related to 'unblocked war games at school'. The presence of numerous external PDF links, many pointing to benign content, alongside the malicious redirector, indicates a likely attempt to drive traffic to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://crophysi.ru/wix?keyword=unblocked+war+games+at+school In PDF document text
    • http://sokfresh.fun/bsnl_recharge_plans_mpaugni.pdfIn PDF document text
    • http://thrivewebs.com/5593632221015xti.pdfIn PDF document text
    • http://kulinar2020.site/lekijoaunxi.pdfIn PDF document text
    • https://rabizelen.weebly.com/uploads/1/3/1/4/131453176/5260169.pdfIn PDF document text
    • http://islemleriniz.org/solucionario_beer_dinamicaz8x8x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/79687381385.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/xolikogevasisisalagupiva.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/math_worksheets_for_grade_1_symmetry.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/supofegaxivavakogotugo.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/hollywood_romance_movies_2018_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/mevojofepuvapusaj.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/73648118697.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/mijijarugedujaxelifakijep.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/molezavuke.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/67000643858.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/effortless_english_full_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/66598633799.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/13424177782.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_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 5640 bytes
SHA-256: 2e022e06a8fc600b14ef3837ccc9cda630d348985a16c1167c2965741de3ac8e
font_01_sfnt_off0001072b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072B 10324 bytes
SHA-256: 98eab698de606a62c36061dcf732f62c8c04a280b387ccc17ba9d68af21943d1

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