Malicious PDF — malware analysis report

Static analysis result for SHA-256 773367c46fe6c753…

MALICIOUS

PDF

91.2 KB Created: 2021-04-03 00:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4bbfa704fb600465ee8ee97962a67c5 SHA-1: be42a8bfefd1527dd47c1b411b7bbe68e90f2def SHA-256: 773367c46fe6c75326fa7cfaf48bacd7751151dd3738bb213ff9fef001f25496
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO spam campaign. It contains numerous external links, with a significant portion pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=bharata+rajyangam+telugu+pdf+download
    • https://berafakeje.weebly.com/uploads/1/3/4/0/134000448/9d882849c2a8.pdf
    • https://kesozelakix.weebly.com/uploads/1/3/5/3/135300748/fowafurixikad.pdf
    • https://japatuxivavagax.weebly.com/uploads/1/3/0/7/130775167/40966b.pdf
    • https://vavetoros.weebly.com/uploads/1/3/4/8/134854671/1728335.pdf
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/zerur.pdf
    • https://xabizukilitexe.weebly.com/uploads/1/3/4/3/134335342/zakizan_gisawo_zidirusoma_podamab.pdf
    • http://fesabip.iblogger.org/hand_hygiene_ppt_template_free.pdf
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/76a71.pdf
    • http://ssurll.com/10sda9
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://www.daltonmaag.com/
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_10e7a53f51a54f20830c37a3efa2f5ef.pdf?index=true
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_d3b67e4af89447f5b51cf579e5f27d08.pdf?index=true
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_f65fff7edf85414798a98d312445ab82.pdf?index=true
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_cd4d538ab15e46b69b9d1fbe13f74a1f.pdf?index=true
    • https://770603ce-cae8-48b7-b4e8-6e15b9dac1cd.filesusr.com/ugd/e975af_30e8efa88d134eea994c70758807c4e9.pdf?index=true
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_2d293b9b6f7049f39078da22106821b4.pdf?index=true
    • http://gimanumaju.epizy.com/python_examples.pdf
    • https://e29f0852-aa8c-4fc4-a5db-fcd144ab7086.filesusr.com/ugd/b730be_c84003861bc44ba387d09fe6a2e3ef46.pdf?index=true
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_1b7a737263344694a2d1c247dc82481c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd10.bin
d19fe971aa8c21e0df434d50d09ff63c9cbaa1c22021b329f586650cee5aa4e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD10 5432 bytes
font_01_sfnt_off0000ef7b.bin
dc009cea628ed5bd1e7d86e40fed93bfd287770da13dc21af742ee15459b3d2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 28660 bytes
font_02_sfnt_off00012bf8.bin
4245d32dc2ed8fb2ba9858dd7fc6397cbc13d5c2974814abb7d91c27c3c5139e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF8 10600 bytes
font_03_sfnt_off00015061.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15061 4324 bytes

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