Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e2ff66f3a31038…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 18:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0b2f5556f4cfdcb188fcb435a2cdbbee SHA-1: 5c04c22f931571fb67910af59915e1e5bbab44f7 SHA-256: a3e2ff66f3a31038d57e08743f6876f730493b10118c8790dca78fa4a2d5cf7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is a link farm on disposable hosting, suggesting a phishing or scam attempt. The ML classifier also strongly indicates maliciousness. No scripts were extracted, but the presence of many external links points to an attack pattern involving directing users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=alchemy+stars+apk PDF link annotation
    • http://28777886.com/Lpf/UPFILE/userfiles/files/xotukoramar.pdfIn PDF document text
    • http://chpcentre.com/files/file/gakebosogamutipekixekoze.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/49833121777.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/31271784576.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/51487064168.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/91161279175.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/98522295308.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/11139653472.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/4397447379.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/pixilajufuwidakelabiza.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091803460773499.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/80078195098.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/68420037867.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vawunejarikodez.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/30314913504.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/wamutaladed.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/ginosodikizex.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/wenakizamutujomulamus.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133d8bc9bbc3---pejiwaxol.pdfIn PDF document text
    • http://mayjack.com/upload/files/bikozufixekuzepowiludad.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/fovogejigi.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/bonutoxivejenupulafutow.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/22616819644.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/98823082837.pdfIn PDF document text
    • https://maisonforville.be/documents/file/70047661176.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_off0000d47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47E 10508 bytes
SHA-256: 00c1f9c072e7b14107c8aed7f849f2f73ca9de8c95f58e95c49331ec76599d43
font_01_sfnt_off0000ec83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 20888 bytes
SHA-256: 616c4ff8a41844516cef47af0a5609239b22a4c6eb52e6531a924bc8d8d490dd
font_02_sfnt_off0001232d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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