Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac38c1c8355a082…

MALICIOUS

PDF

77.4 KB Created: 2021-09-10 18:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 73110e12ac3182179911de1815739c0f SHA-1: 6b55ce14fde0d7f31368e7127deaaf95abe19072 SHA-256: cac38c1c8355a082f62afa70de0ec96e2a25c29556a5577cb446b0ab717b4e7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains designed to host link farms or redirect to malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=noon+vpn+premium+apk PDF link annotation
    • http://www.anclupnapoli.it/userfiles/file/sonutuvujumiletuluzolipi.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090609230673499.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/56124052521.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/88757305029.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/ronoxukejukebupevuz.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/51300253016.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/tirukupugiduroko.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613235ac81f8c---votewa.pdfIn PDF document text
    • http://rvhifi.cz/files/file/jarexovidukuz.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/16297777984.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f4812275b---jufovisorarepinixaw.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/15721042266.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/2037058536.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/xurikojarojevunegenifo.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219360443560.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/92107160926.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/5857164048.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/35668718675.pdfIn PDF document text
    • http://rts-3.ru/upload/files/27482218168.pdfIn PDF document text
    • https://suncables.co/images/file/bulatapoza.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/pebefun.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/75872775750.pdfIn PDF document text
    • http://safetruck.gr/images/file/fozujiroxirezazajumumi.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_off0000c98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98F 10336 bytes
SHA-256: 13ea6a1641f47753ed3b45dc93558450fce588b2e236464420df4553f7b69630
font_01_sfnt_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 18108 bytes
SHA-256: 0a398e4455c2d40f6d161ada43ce3981be230ae7027be45942ad6b588bfe422e
font_02_sfnt_off00011059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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