Malicious PDF — malware analysis report

Static analysis result for SHA-256 2241c736eb1e6eee…

MALICIOUS

PDF

74.0 KB Created: 2021-03-28 06:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 874197655d83e33f24b4e33f902f01e6 SHA-1: 173ad5c5f0bfaa19d829dc19fdd398cfa0c3156d SHA-256: 2241c736eb1e6eee526c5789934eb198e3449b81123f82d2dec8fc0b8320b175
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM'. One of the primary links, 'https://leonvi.ru/strik?utm_term=what+are+the+risks+of+clinical+trials', suggests a phishing or scam attempt. The ML classifier and ClamAV also strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://leonvi.ru/strik?utm_term=what+are+the+risks+of+clinical+trials PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/posufij/terraria_android.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/24109789935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43edad18-3a7d-4fbd-8a43-27da0f4e40b8/how_to_train_for_first_ironman.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/what_are_the_different_types_of_emotions.pdfIn PDF document text
    • http://naxesabefadufu.atwebpages.com/6738652583.pdfIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_8a9da708e4a54a449d174f540af54695.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d2257b-e22b-4893-a636-4980c2554817/galaxy_s9_plus_charging_cable.pdfIn PDF document text
    • http://dogiwexor.myartsonline.com/how_to_stretch_tight_shoes.pdfIn PDF document text
    • http://mogixos.atwebpages.com/scouts_badges_and_awards_book.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/ropegazoxilomejubef.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/wujuvenuvugurufox.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/wejupekurug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b54927-d2e3-46f4-a921-cc27c8e08225/muxek.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/riddles_and_jokes_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d04e1c1-fa7c-4ada-8d39-6f8d42d95f71/is_deepak_chopra_vegan.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/29332319319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ede69b-79d9-413f-97f2-cdc684a497c4/34297907319.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/gopunikaziloguxojew.pdfIn PDF document text
    • https://4f6c49ad-35c2-4e1b-a50e-a4ca4816ee30.filesusr.com/ugd/a28dad_136c46d342f04384adcf16baf045aa7a.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_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 5048 bytes
SHA-256: 4a7e513d43de145d364e0765afe7bc1df9c0dc31815d1ed9062f3923fbaeba44
font_01_sfnt_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 12400 bytes
SHA-256: f1c40c4fcd853bad56a24de95a715cb1ac7a5bf1071bdbb0823c7a458981a92e

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