Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a35d35a13382b0…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 18:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0ded37b7c23abf53cbfe51da115715cd SHA-1: b8abe323949870c7e0c843d5109727315b6d4abb SHA-256: 45a35d35a13382b05d86f33e8643aff0101a8e009c73c3cfc81e9bd9399c27e1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured as link farms. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a deliberate effort to obscure the ultimate destination or to distribute malicious content. ClamAV detection and ML classification further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://vkts.se/userfiles/file/kufiruribewamozutiwo.pdf In PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/liwazitojekej.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/zotelederelakanekavewoti.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/lisudiwixinemok.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/goseminagizefibina.pdfIn PDF document text
    • http://ombs.ru/uploads/files/43961773492.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/depupemipojugebobusotipu.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/34441500203.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/45789556850.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/42705158875.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613029B8A7D53.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/namifatexowijami.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/zuwilijafetixurexom.pdfIn PDF document text
    • http://maksimetall.ru/files/70771193387.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/89450117321.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/17334289152.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/gasisilosafemojokos.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/jiwajekakijenipil.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/80579867262.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/47494653288.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/55533851441.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/73016478123.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/85669286488.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/nexovezukuzidibota.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d662e842ea---silarezovemuvitirukeseg.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/tutekip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+set+song+as+ringtone+on+android+phonePDF link annotation
    • 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_off0000b5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB2 17712 bytes
SHA-256: 310c84a04d4b880eb6d0d96e9b24c01a36bcdfa01a98ae7436cb6b2d0c404eea
font_02_sfnt_off0000fa1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1D 10704 bytes
SHA-256: b881f45384abcf58f29d9466390a168955268e59f3562769515af6ed0e69cf5b