Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac070033d99be06b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 13:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 412f2e54131fbc4e5e70df27539bd162 SHA-1: 2da2e0669de09a399d728f2b37fb75489988e314 SHA-256: ac070033d99be06bc5df08281cf2f3b1cdd7b1fed5820b902f2d935a4a0fb7ee
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs, including one pointing to a raw IP address, suggesting it's designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wastran.ru/uplcv?utm_term=talking+tom+and+ben+news+mod+apk+unlocked PDF link annotation
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/zofigibi.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/72914174122.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/44345100755.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/denumakujizivevakukerubo.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/bixoreduriwur.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/nizakimikafeji.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/54055585247.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/72969355436.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/77310421248.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/431152d40914b423fe9dbbc40811bee2/53193816977.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/wulupedut.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443b8a79f6a---wamazutajebuserobuwutave.pdfPDF link annotation
    • https://profipreklady.cz/www/ckfinder/userfiles/files/visim.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/61989641726.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/44408185189.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/polutifuwopa.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/numome.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/65487996117.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/niturinokogoridonuris.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/63010592106.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210911135325.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/27189657649.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/gorexepig.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/kazonaralasedazifavizogix.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/29142174404.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_off0000c420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC420 17196 bytes
SHA-256: ba5e1488faae3091f1847ef700950be81429adac8e7368ef4bd31a8ac6aebc50
font_01_sfnt_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 11140 bytes
SHA-256: 4a10cca7eab36619d95d64025b5c433a7998c6f5704d9c1fffafd91973e9c3fb