Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce720e0a9350cd32…

MALICIOUS

PDF

83.0 KB Created: 2021-03-05 23:18:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 849d7c9a6d3f24c2cf86931c727c4932 SHA-1: 87f2e16a956db31c1888a12ae9d76760ce7afd04 SHA-256: ce720e0a9350cd32cb253a5ebab2ae7bf8afcc5bf3dfd25b217eeaaed862b618
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicating a link farm designed to obscure the ultimate destination. The primary URL, 'https://gimoguvi.ru/strik?utm_term=davis+drug+guide+16th+edition+used+book', is presented in a context suggesting a lure related to a drug guide. ClamAV and ML classifiers strongly indicate maliciousness, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=davis+drug+guide+16th+edition+used+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416806/normal_601313fa6b06c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445321/normal_602ad33c3d480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493589/normal_5fda656af4105.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_8cc6e68b8b7e4fc288fd58a40ebd6a43.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fad3cc0-931c-43ac-80db-8f3d7d21a475/starbucks_barista_shift_supervisor_job_description.pdfIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_5b91755232fa4f7ea6bad077a189bc9e.pdf?index=trueIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_f51dbcd1c6d94be4a63541807e7be92b.pdf?index=trueIn PDF document text
    • http://waboxizolomove.rf.gd/bamini_keyboard_layout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a34db00-a35f-4a6f-9703-602ef1d81e4e/how_big_is_the_running_horned_woman.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/34135840586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c399ebfc-b9aa-4101-ac59-da4ada74aa9b/mekobujurib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef5e45f-9e95-484a-a5b1-0e111c619702/gowudifapusujan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f117637-0340-4ba5-87d5-f744d9a0053d/pride_and_prejudice_manga_read_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69db9a57-0fba-4e91-b903-95e04068b3d8/how_do_i_get_a_stray_cat_neutered.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/30377089924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38975503-8ac0-494f-be99-b4038d61a639/67334175490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da7faeea-a56e-4f32-a39f-f047a409a3c3/37180002076.pdfIn PDF document text
    • http://zasuridedowimam.rf.gd/zitele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11df680e-c5a9-43bd-bd41-9a92e160e5e2/2006_bmw_330i_oil_quarts.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 5408 bytes
SHA-256: 0cbc6d718d1d87e0858fc7f7562b61b5ac6d0f4819ca57f480ca1d4b9bd7b6cc
font_01_sfnt_off0000f4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FA 10628 bytes
SHA-256: 3ba3b41b07fa32c66a1bed630d308afb96edccde1629c17768c0cf89032d4b2d
font_02_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 16084 bytes
SHA-256: 462d13bd97d7d9b38b38dac4ddb889f891d4742debcdf3bbf084b15d68e01d41
font_03_sfnt_off00012e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E64 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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