Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2bf7e1f4ad7a04…

MALICIOUS

PDF

74.7 KB Created: 2021-10-04 06:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f7a7f98f73ba6b5c2aa58a50f37ef5a9 SHA-1: 4ad446329ffcb16b1361ca3a6894ec0ac29e7e98 SHA-256: ab2bf7e1f4ad7a044fc214a8eeb56439c49b92fb476629e9102d8956d8791752
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common tactic of luring users to malicious sites.

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://infrive.ru/uplcv?utm_term=turn+pdf+into+text+file PDF link annotation
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/fuwimimeje.pdfIn PDF document text
    • https://derfo.info/resimler/files/vumoxelape.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161444ff2783b3---xelofawo.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/wopom.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/kemisuboluzoloda.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/49121750881.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/pexano.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/25192967057.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/31213297099.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/23763292967.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/gisiletij.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/kibasa.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/7248829304.pdfIn PDF document text
    • http://ttc-investco.com/img/files/19721103407.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/zafajipalisarokoko.pdfIn PDF document text
    • https://kar360.com/resimler/files/mimovoveba.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/52274541308.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/radusi.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/govij.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/29112640555.pdfIn PDF document text
    • http://michigan.easydefensivedriving.net/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/sixelere.pdfIn PDF document text
    • http://www.heksan.com.pl/file/4695666725.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/gusolezitiwajotirodozam.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/90046673126.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c45fe04694---tikufak.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_off0000b982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB982 10324 bytes
SHA-256: be6b2c913e583de2d2c76ac5a740ba083131c5855bb17a75edd18a315481cf55
font_01_sfnt_off0000d0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 20152 bytes
SHA-256: 0099bc63006921045e3ff1fce83f259aa8eafea358b6b11fa4b33d1486ea9c8c