Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b29ec94394143b…

MALICIOUS

PDF

77.7 KB Created: 2021-09-16 02:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d406d26d841ebf08e29920ada360ea95 SHA-1: 7e0d5d3b3571c34c61482f31be647b3deed48786 SHA-256: 39b29ec94394143b7ae92f9b4d74b20ea3c268c04bb0a0c518803b8b50e43258
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. The document contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=what+are+text+files+on+my+phone PDF link annotation
    • https://istocdukkan.com/userfiles/files/zusodenu.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/75990786516.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/29810422910.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/rotir.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/putedurizekomaxidujilu.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/pasolijejo.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/xuxixolu.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/tinavikosojatarej.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d68e9f57b---benipizifovonojema.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccb7edb3f1---zufavone.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/77115733029.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/numavudukuluzasikebudi.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/gatafirizapisijij.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/35995640092.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/zofika.pdfIn PDF document text
    • http://esteel.my/userfiles/file/gowebuwodiwajaxiwinarip.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/powibabuwevitagofow.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/8133472604.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/fubeguga.pdfIn PDF document text
    • https://majubesar.org/contents/files/forivedajufutapelatagawu.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/pexapun.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/59781232941.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/22812039583.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/xovafanunizobudobu.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/21125247339.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/vosilo.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_off0000cce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE4 10832 bytes
SHA-256: fc6b96f5134f49b768174053169da191eac4cca15523f89b7774c7f4c9794bbc
font_01_sfnt_off0000e5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BC 16652 bytes
SHA-256: 3ecca3b52819a141bfe341bf1fd3aa4a0709ee5ebbea486fd760d026a346bb9a
font_02_sfnt_off000110ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1