Malicious PDF — malware analysis report

Static analysis result for SHA-256 638ec7568284baed…

MALICIOUS

PDF

71.2 KB Created: 2021-09-23 02:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 563a093b2be9e32605dedb9e47d1bcb8 SHA-1: 278a47e32f07b51f4e3925212a19649bb1319136 SHA-256: 638ec7568284baedebc3b8c75a75f85eb8a5deb60f955c5a5b0eeebed8a69d77
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The file contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing operation. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies the PDF as a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://corising.info/sa_upload/userfiles/file/20210902024521.pdf In PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/11714911725.pdfIn PDF document text
    • http://birdwatching.sk/media/file/8057989991.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/25360800908.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/30814595982.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/06/45084529164.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/89789011928.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/deruvogam.pdfIn PDF document text
    • https://matratva.in/userfiles/file/94898130542.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446fa686587---gepumanapalutuwizefenum.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/64332950641.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/duxisusun.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/5263653184.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/pomapemuveripofiliv.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/nipolovujepofajevo.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/kedon.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/jivobebimibutinir.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210912_C4258DABAEA98313.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/39525914104.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/futatofomus.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-13/20210913103601424220.pdfIn PDF document text
    • http://rilta.net/userfiles/files/80390717398.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/88388204331.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/10487124316.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/gopovalojudepewumidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=spongebob+episodes+freePDF 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_off0000b32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32C 17840 bytes
SHA-256: 730bea85c790a585eac759e9c7dfca5a9536186faeb183d541db8414d157834c
font_01_sfnt_off0000dfa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 10584 bytes
SHA-256: 2ff205eb869ef912e10d4862138626a16ca007f071b2b24b00732fbd1e3c89a6

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