Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51ebd92e75589d7…

MALICIOUS

PDF

86.4 KB Created: 2021-03-08 03:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 438c9297f3f8a3f933b90b0b45310b66 SHA-1: aadf875a7a8087f89def4ce0307f6fe8492c6d4e SHA-256: e51ebd92e75589d7180c765cde443ad584847da1ebd9697d77a54ffda5d31585
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent. The embedded URLs are likely used to redirect users to phishing sites or download further malicious payloads.

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://druttle.ru/wix?keyword=beautifully+damaged+l.a.+fiore+pdf PDF link annotation
    • http://premial.su/wewifarusejasejanigilekiotn2y.pdfIn PDF document text
    • https://temizitukopisir.weebly.com/uploads/1/3/4/8/134898891/giropixere.pdfIn PDF document text
    • http://hyipinvest.site/boi_bella_vision_2020_musicyjpup.pdfIn PDF document text
    • http://winsbig.space/56057550004kfnpb.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/jareribifotasikazelofe.pdfIn PDF document text
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/pifaxal-kepoz.pdfIn PDF document text
    • http://kyukty68.xyz/703743092729nrbu.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/triangles_3_exterior_angles_worksheet_answer_key.pdfIn PDF document text
    • https://sojagifuwolu.weebly.com/uploads/1/3/4/6/134689160/womoxinasu_wawuneg_lusexorofi_zurul.pdfIn PDF document text
    • http://lamejix.scienceontheweb.net/what_is_economic_development_meaning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_cbb217d507c843cc906fa5163444a0bc.pdf?index=trueIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_7a47edfa404944aaa6c12827bfb53370.pdf?index=trueIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_9e8d673923914b96bd8a57a03f8c9fb6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/aqa_epq_examiners_report_2018.pdfIn PDF document text
    • https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_71b8bba96e3a4d9e9da0e1d3577059b1.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_b258180715044457b50ffad103a44adc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusixa/where_can_i_learn_photography_in_ibadan.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/satepirutov.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11324 5368 bytes
SHA-256: 35f326e939fdc357ce82152d78355fa9c161687bc85de18aa242ab3ad6ce9148
font_01_sfnt_off00012565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12565 11840 bytes
SHA-256: e94c917ac5dc4647a9e7aee24022e3ef18f5738fe00798eb81a6e818fbd35404

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