Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb39ab5814c3ec2a…

MALICIOUS

PDF

86.1 KB Created: 2021-03-11 11:03:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5aa47de836005b38511f4c29cc63cfa SHA-1: 5889b8636bf6af56fc885dc3c54b9d58a18ff514 SHA-256: eb39ab5814c3ec2a63f7265fdccdff4ade9277301dcb17b2ced76efff4f02384
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to files with SEO-friendly titles, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://golowaki.ru/wix?keyword=stoichiometry+practice+test+chapter+3+answers', is likely the initial lure. ClamAV and ML classifiers confirm maliciousness, flagging it as a phishing trojan.

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://golowaki.ru/wix?keyword=stoichiometry+practice+test+chapter+3+answers
    • http://zebizadojol.iblogger.org/42049254344.pdf
    • http://nujatofu.22web.org/lawujofezepapetalojanezan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_36b7ec91321b483e87ef4a2187df7cd4.pdf?index=true
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_34e7909ee9f24ecb99b47d5248d62921.pdf?index=true
    • http://donirodep.epizy.com/graph_reciprocal_functions_worksheet.pdf
    • https://s3.amazonaws.com/zomuzigo/windows_movie_maker_crack.pdf
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_44866a92a236450dadec1524e05db5c8.pdf?index=true
    • https://s3.amazonaws.com/vovopafubipu/is_apple_audio_books_free.pdf
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_31da6e8a59fd4f0bb433db8c01ad30bc.pdf?index=true
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_2db9c232489447bd990ea139f04a1d3e.pdf?index=true
    • https://a208a2de-cee2-48c2-86e3-c620a022946d.filesusr.com/ugd/dda32d_0184106f74b7431fb479189f5296335d.pdf?index=true
    • https://41d9b059-0b17-466b-96e6-f31a3f3e9b19.filesusr.com/ugd/f1ead9_9c0dcfc1577147c48d6051d7fe9d059e.pdf?index=true
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_e17fe3d057434c9681acc34b65e16513.pdf?index=true
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_35424646ad36449da6bb23b28f18ffa2.pdf?index=true
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_be8befbc9b1640cf837739a66a3bc042.pdf?index=true
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_c0fd268318e74bd89fbf828144ca0e1e.pdf?index=true
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_10726c39381e4a8c801930794ad44d02.pdf?index=true
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_91049f05b207422999d44211bfa26749.pdf?index=true
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_f988305ce1a840639713018b0f60bde0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f91f.bin
cbb52481ce94e16f1aa7c1e5556943e0858c32639ae52c58d7d3596933ba349e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 3016 bytes
font_01_sfnt_off000103db.bin
4ca64bfeb9c6b167f980cd09b184b382a09670e9d0d3d6b14d5367d339ed8573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 5604 bytes
font_02_sfnt_off000116dc.bin
4eb19928acd6d8c400f06d5cb700784b80967c7f6781b5f5c9578702b8c8b102		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 17456 bytes

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