Malicious PDF — malware analysis report

Static analysis result for SHA-256 6360056e10184142…

MALICIOUS

PDF

70.5 KB Created: 2021-02-22 16:38:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4dbe0147554da44cfe16df61e12878cd SHA-1: c8c722ec44d27e708b1397f0bed61ecca3763191 SHA-256: 6360056e10184142ee96fd51e6c5abfe99c31289b1b14481907e5713668b486b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, suggests a lure related to 'They say i say chapter 2 summary'. Numerous external URLs are embedded, many pointing to link farms hosted on disposable domains, which is a common tactic for phishing and malware distribution.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=they%20say%20i%20say%20chapter%202%20summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457848/normal_602375745d162.pdfIn PDF document text
    • https://cdn.sqhk.co/xakalodesi/iaOHMgj/snare_drum_protector.pdfIn PDF document text
    • http://hookup157.fun/gazejexisezeraponutibojegxn7o.pdfIn PDF document text
    • http://letxxnx.org/najefetejixewijihraie.pdfIn PDF document text
    • http://arm-watch1.club/nokofopifz8263.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495264/normal_600a722e33ea0.pdfIn PDF document text
    • https://cdn.sqhk.co/mujowofapubi/icghjRW/large_rc_race_boats.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/523430821438902a.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/290d8a9.pdfIn PDF document text
    • http://pagexonani.iblogger.org/loxalunavu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruzuzis.rf.gd/mathematics_form_3_exercise_with_answers.pdfIn PDF document text
    • http://kozifina.epizy.com/xitedelatuwibogalepazugok.pdfIn PDF document text
    • http://kulitetokap.epizy.com/canada_day_worksheets_kindergarten.pdfIn PDF document text
    • http://kijemuf.epizy.com/5849940146.pdfIn PDF document text
    • http://xovafufu.rf.gd/nomuripuvubuwetumagibagiw.pdfIn PDF document text
    • http://poruroj.epizy.com/12033972256.pdfIn PDF document text
    • http://fowewimoseno.epizy.com/10906011530.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_off0000d5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 5324 bytes
SHA-256: 4eda704a0bee122ebee004cad19a639ddb1e9beb61bca5b172b809bd33772b31
font_01_sfnt_off0000e7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B7 11084 bytes
SHA-256: a8e70138d3a56bcc2b154570ad5d3e75e9960978afec221d43ecfc682f1d2267

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