Malicious PDF — malware analysis report

Static analysis result for SHA-256 28081d835315769b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-16 09:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11600396d411f35208b1cd9ee5e5ed92 SHA-1: 9732cd60a760ec9d0a9c0b31283c1f230659b8e6 SHA-256: 28081d835315769bfa18afcbaccdd9ee574c49b0b4253ea133b0bc16da25afeb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link-farming or redirection scheme. While no scripts were explicitly extracted, the presence of external links and the nature of the detection indicate a likely attempt to lure users to malicious content or phishing sites.

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 http://volareinmongolfiera.it/userfiles/files/sinon.pdf In PDF document text
    • http://kasintorn.com/images/upload/files/tofew.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/nelevijalilarekaxemewidi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/92636647952.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/c81767f1d0fd6d41184335b04ffc2046/89584826283.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/80685855178.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/j4gti1ad5el2lhkqoq94gk0m3l/zawokukefesenitejadu.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/gezonulez.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wawidivuresedixatafagumuf.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/gorelak.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/92370491776.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/65059613143.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/49862097324.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/29849809154.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/80000031838.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/66270619959.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/rolutomekepavomutitemoju.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/84939878395.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/xexakubuxugibavufimoris.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/18777602906.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/34000239136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=como+beach+perthPDF 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_off0000d29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29D 10400 bytes
SHA-256: 2cb32982fe353f4b57fbb222ef0e2dc7b88af79f69b08d121a4a19e9fc35db8d
font_01_sfnt_off0000e9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 18448 bytes
SHA-256: 10a25ea5e58b55ccfc9214933ab47bb3a85e3c719b23bbb8b8093457493a96f4

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