Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca076f929e742d3d…

MALICIOUS

PDF

72.0 KB Created: 2021-09-30 12:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ce70ead7cf25c02a6beeec30803ec645 SHA-1: 397c7a471d4255821050a79ba7d609a9b3c1322e SHA-256: ca076f929e742d3deeca7e9efc6b4901e7830498bded7459ba6ab88348491f13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable or unknown hosting, and one heuristic specifically identified it as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's intended to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://binhchuachay.info/Images_upload/files/21793701542.pdf In PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/rakonodadedaj.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/77975922022.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/mudikipujabawejizutez.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/87039663252.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/noroga.pdfIn PDF document text
    • http://szpk.hu/_user/file/tosew.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/sojapifenuvufevosatoxid.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/tesimezevofiv.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/81875453905.pdfIn PDF document text
    • https://pansky.ru/UserFiles/File/65756604344.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/salikaxowigagesomemowu.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/dp3i1md89kp7mugvhbdkcib1q4/guradivivevibuxusiwex.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/29468056275.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/lalepox.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/42144460066.pdfIn PDF document text
    • http://st03.it/userfiles/files/7340148689.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/dikete.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/70770790589.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/25220793113.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/84544651078.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614be33d9e49e---todenode.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/10/file/kuganixinileb.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/15036043595.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/61179991916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bhagavad+gita+tamil+pdf+downloadPDF 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_off0000b593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA5 16992 bytes
SHA-256: 5771448ee8cfd9e94df505b25b0d31999654bbb109f4e01a81ae4497ebcb8677
font_02_sfnt_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 10748 bytes
SHA-256: 0c7afad88772f9b29fc11b114e85cc88b780bb745219db8168bf2742154161a4