Malicious PDF — malware analysis report

Static analysis result for SHA-256 3362f35503660d3b…

MALICIOUS

PDF

72.6 KB Created: 2021-09-09 07:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aba6fa86ec3081a731e6c38da6eb34cf SHA-1: 140cfe444dab2a2820f371320c70fe200f0329de SHA-256: 3362f35503660d3b09d95b92b60ca71aba79a9d3ed6b70f72ac67f07ca636a90
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious or phishing sites, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests a deliberate attempt to create a network of such sites. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript execution to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=how+hackers+hack+the+phone PDF link annotation
    • http://chi-kara.net/userfiles/file/10590269100.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/sijaxolonidogixapi.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/zivilukonopapilamo.pdfIn PDF document text
    • http://mp-journal.com/media/file/kabadozasuduvipozejub.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/6327348925.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/97752017716.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/88256547933.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/xovolerepesifumenubadufux.pdfIn PDF document text
    • https://protrialse.eu/files/files/97756352141.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/pixogosovenawolulujileje.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b81a11e63---zotivasajoxa.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/luxufil.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///72088725029.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/a4b6244cb923df922cbc69dac1e86cc5/tudode.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/71223714413.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/70682689495.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/xofen.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/47033797819.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/gadexikokisibepiluteferex.pdfIn PDF document text
    • http://bushurov.ru/images/files/nilixikawemupamojo.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/daxebujo.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_off0000be59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66B 15304 bytes
SHA-256: 3207b12021f5f71605e2ca853094a2f17749e252f323e747ad692b2ea7421b9f
font_02_sfnt_off0000fd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD01 10500 bytes
SHA-256: 2b09a94460269a2a07a4197cdaa408e5444c840f2d1ef8e343811985e5afc6e3

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