Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d27f0d37b8361fc…

MALICIOUS

PDF

84.6 KB Created: 2021-04-19 22:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d7ccd9e7dd0847199bf73ef9e6c835b3 SHA-1: 9accccd113d8a6de08b9f5ccaa6c88a4d2be8f09 SHA-256: 4d27f0d37b8361fc4d6e6a94e456fd0b899446455d24dd6725b73fab0261957b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a book summary to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=un+grito+desesperado+resumen+capitulo+3 PDF link annotation
    • https://mozawexi.weebly.com/uploads/1/3/1/8/131856146/dovudoxodox.pdfIn PDF document text
    • https://lefatelaxebaj.weebly.com/uploads/1/3/5/3/135398996/4916352.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_60591048b0aa2.pdfIn PDF document text
    • http://goxoxitinewowim.22web.org/insinkerator_777ss_clogged.pdfIn PDF document text
    • http://wisecreditscore.info/dutuzemamemurum6k1l.pdfIn PDF document text
    • http://ijmalan.xyz/45284690404q5fg0.pdfIn PDF document text
    • https://radolawijukigi.weebly.com/uploads/1/3/5/9/135992833/6919922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383567/normal_60579e84aac0c.pdfIn PDF document text
    • http://cabinetsop.xyz/448182113796l09w.pdfIn PDF document text
    • http://bodibuburotegi.22web.org/sap_bpc_reporting_training.pdfIn PDF document text
    • https://powofowus.weebly.com/uploads/1/3/4/5/134583567/jiwukojoxotuwawilora.pdfIn PDF document text
    • https://dogonojibot.weebly.com/uploads/1/3/1/6/131606640/2927128.pdfIn PDF document text
    • http://cryogen.me/pizakovudogosaxominalifalz1q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mubelurodi.rf.gd/poemas_de_gustavo_adolfo_becquer_rimas.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/ghana_english_worship_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/borose.pdfIn PDF document text
    • http://losirerosusakaf.rf.gd/mojup.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/dixopirotapab.pdfIn PDF document text
    • http://lulevewutowa.epizy.com/kizadabivovazexuxeno.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/practice_c_programming_online_free.pdfIn PDF document text
    • http://raredinufewota.epizy.com/abcde_del_trauma.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/witozatobaxewen.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_off00010afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 5548 bytes
SHA-256: c19eface50e958274105a930b60247b3dc1740affcc195578c31518265ed2065
font_01_sfnt_off00011dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 11468 bytes
SHA-256: 6f68f8a5777325038df1a1ec1d9876a504fb553f35f6ff85b75b7050fe8d2c13

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