Malicious PDF — malware analysis report

Static analysis result for SHA-256 f264f6b57e3be8ae…

MALICIOUS

PDF

73.4 KB Created: 2021-09-24 22:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80ab36ec654cc30280b2911d376aa003 SHA-1: 2224c064f11f45dedd1d51bb3fddf4d7c0f2019e SHA-256: f264f6b57e3be8ae29fa1d79797ca5e2378c9049953600363f3ea8a7c872f9d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a likely phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=htc+windows+phone+8s+xda PDF link annotation
    • http://longbeach.ilovepokebar.com/uploads/files/kavid.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/11001021778.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/46676790071.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/sazujunizujesix.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/19936010680.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423f002ef7f---runuvilutuwofuj.pdfIn PDF document text
    • http://gmt-tw.com/app/webroot/userfiles/files/nikelareraxidamigepusa.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/45660177626.pdfIn PDF document text
    • http://a899.net/userfiles/file/pamufakogokefabefot.pdfIn PDF document text
    • http://bienbao.org/uploads/files/97029756434.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/bojatugowogixige.pdfIn PDF document text
    • http://chikatere.com/Upload/files/85851584704.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2891f921---90641833333.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/60451477516.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/senubetekirob.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/82316651643.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/13617698460.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/57044073465.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/wedekegofo.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/61943910615.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/dumosofaleduget.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/xuxugodisotejuwan.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/bologitezebusirerojunowu.pdfIn PDF document text
    • http://lulanjina.net/upload/files/koxumovijolubiriso.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF77 10852 bytes
SHA-256: e701395307650cf8f587813b33c7ceaae0a1358ac1471022715ee4eda06e709c
font_02_sfnt_off0000e889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 18320 bytes
SHA-256: eb44fc37f0915f39d8783f2266899ac79cf55a69d03f7072e863b1b308c02e4e

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