Malicious PDF — malware analysis report

Static analysis result for SHA-256 848f1e06ef68d369…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 21:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3ea1d9045587c294363672e27ec224c SHA-1: 62b0a8e4429d0dd48a13521fd9b526f6d1f5ef46 SHA-256: 848f1e06ef68d3691dabe1d6c22141f15cef77262911eb9b0c1f3d47034ebe1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with one specifically disguised as a sensor download, likely leading to a malicious payload. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest a campaign to distribute malware through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=download+magnetometer+sensor+for+android PDF link annotation
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/32459414049.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613033d09b67c---23617376019.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/bubopuvagetibej.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/72753635301.pdfIn PDF document text
    • https://studioconcept-stand.com/fck_userfiles/file/56441797268.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/sukewibelebefegotetevera.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/92559211025.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/87993167812.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/xamafuje.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/69441080596.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xabebetowojul.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/20666951967.pdfIn PDF document text
    • http://silver1979.com/upload/file/gisiguwabu.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/9064675805.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/46342474674.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///11259781654.pdfIn PDF document text
    • http://tid.vn/upload/files/49492778616.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/rekepovezulagowaketi.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/goponesebipa.pdfIn PDF document text
    • http://learningkey.org/userfiles/jekakekizawarogowokusaxa.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/jikizimibelife.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/neviparezuvip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341c73acfb4---79246245308.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/57048313759.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_off0000d755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD755 10784 bytes
SHA-256: adefe559cb852743dd50ad50f04247f7d4cf3f8347fe2c314b1009d3f585cac8
font_01_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 17788 bytes
SHA-256: a1c64bbdfb81a211a4dcb74d5103bcd50c4556d3bd884eaec92458b308d89668

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