Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d31102b8fcd88a…

MALICIOUS

PDF

75.1 KB Created: 2021-03-23 17:16:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fce66dba739282c9ba0818eab28de95b SHA-1: 7a491d184b719319ebcb6baa192817eb1eb61f45 SHA-256: b2d31102b8fcd88a5af6690fba8f44d959f41dde959d4ad4900deff4f2c76e3a
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, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one heuristic specifically identifying it as a "PDF_SEO_LINK_FARM". The document body, though heavily obfuscated, suggests a lure related to trading or financial documents. The presence of external URIs and the link farm heuristic strongly suggest this file is designed to redirect users to potentially malicious websites or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/award?keyword=swing+trader+s+bible+pdf
    • http://vbnmcxz.xyz/words_their_way_spelling_test_templatexdo9c.pdf
    • https://nuxelimifa.weebly.com/uploads/1/3/0/7/130776070/1049236.pdf
    • https://cdn-cms.f-static.net/uploads/4480891/normal_605575a355dfb.pdf
    • http://dresdenpharma.ru/10369892830n7wx1.pdf
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/7463708.pdf
    • https://cdn-cms.f-static.net/uploads/4373788/normal_60387631abc29.pdf
    • https://niforobufuxir.weebly.com/uploads/1/3/4/5/134512868/c9850aaa.pdf
    • http://discount50.pro/setemuluwtpgh1.pdf
    • http://mylic.ru/how_do_you_use_a_bissell_proheat_2x_healthy_homeuxct3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_53a69f98fd4341a5bfc56467f82d6370.pdf?index=true
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_13fa3da3e89a46d6ac321f7fdd4b233f.pdf?index=true
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_80cbe592cd8940d3bc0b421ae3967f5e.pdf?index=true
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_3ce85ffdc4424733ad45af43e22a0e5d.pdf?index=true
    • https://8c77b9b7-c39b-43d6-9406-6086bd2c0f93.filesusr.com/ugd/ee6770_6d41432fe3404262a6c745d4a9a09ca8.pdf?index=true
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_2ffea0870fb1463f9c5960c69f558b0c.pdf?index=true
    • https://60883313-e483-4213-bdf2-3844198a3b35.filesusr.com/ugd/3ba96b_8f88797804974931a0adb43edf28817f.pdf?index=true
    • https://7d14b3fe-44ab-47f5-a5a4-fb5d7998febd.filesusr.com/ugd/ba499c_942330e34c8d4370bd23a0d7fc1a2392.pdf?index=true
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_64cb19fe33c246559a4098c0f93b4c6f.pdf?index=true
    • https://2df275fc-a8dd-466e-be95-33fe0afe7bed.filesusr.com/ugd/9b6d1e_f7aa65d461e84583a29da661eaca16d2.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72c.bin
b0956cd2a397b5565e4f04a1159237d20eb6c45e8ae6b43a60199e33b66d1235		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 5544 bytes
font_01_sfnt_off0000fa21.bin
9d4506a82196b5af3467bd7b81dfab5fde74737f4447f6a6e026d8fc7e0af411		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 10856 bytes

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