Malicious PDF — malware analysis report

Static analysis result for SHA-256 6337c665efba74e8…

MALICIOUS

PDF

77.0 KB Created: 2021-03-17 18:51:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bba3dfbd56d149441e9e6d0eb94fafb1 SHA-1: 87faa845e6874304cb2ac8be5aa733bc795d0f11 SHA-256: 6337c665efba74e8d8fabed464ee73925d7d90a844e0de812975458cfb6a67e1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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 https://baarspo.ru/strik?utm_term=do+all+amino+acids+contain+nitrogen PDF link annotation
    • http://kovemiwixipogaf.66ghz.com/allyn_and_bacon.pdfIn PDF document text
    • http://wuzotevoxed.22web.org/pibinukezafelovebinisiwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_5fe716b63032f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387567/normal_600d6f60265a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_603bd25e906ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_226a175ca57641a787a88c680c927d99.pdf?index=trueIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_420bc77c48fc44ef8903acf06f9ce2a0.pdf?index=trueIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_1139ee19d7cb4f64a2aa87ffbcac37e7.pdf?index=trueIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_b2c748cec0d346d59b1a6453a7a71d06.pdf?index=trueIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_9a8b2fbb4849493893eb55bd54421645.pdf?index=trueIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_8c98a8b916964afaafbaddb739896ca7.pdf?index=trueIn PDF document text
    • https://ee6e56e8-c390-49d2-810b-d4defef8b9c1.filesusr.com/ugd/eda187_7010d5703a8949c6b65c4ac1648e9c67.pdf?index=trueIn PDF document text
    • http://favugilodufim.epizy.com/certificate_of_incumbency_sample.pdfIn PDF document text
    • http://bebakujudofofel.epizy.com/5810129436.pdfIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_6b3d78b569044a7c870bfb9426a7bf30.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_81f338f0c03c4c0da9a2046701c5c7e4.pdf?index=trueIn PDF document text
    • https://c30b87d5-e38e-4f4c-8f61-e356d9eaafe8.filesusr.com/ugd/347120_88a1f5a9e187405da47e852304d38fea.pdf?index=trueIn PDF document text
    • http://vedumojaje.epizy.com/mit_app_inventor_2.pdfIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_4980330f9ced4c68b51d0bb06010c431.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 5260 bytes
SHA-256: 3b27ead312d87f2bbdb32723607b5492849753d7917430b5f5178f490f06776f
font_01_sfnt_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 10492 bytes
SHA-256: a24a490c763974e1fdb9a0446b94540d167e4e2fe3cfcf17cc19b5e087410064

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