Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5996118039f049…

MALICIOUS

PDF

87.6 KB Created: 2021-03-10 23:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c608ea5ccbad280a70080ac41faeb51 SHA-1: d01e06bcde46ae67e0dff9ab0cca197c351dd32b SHA-256: fa5996118039f04916178eca2884327adc74ae6315f41344a1191d3648da81b1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm designed to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/aws?utm_term=polaroid+tablet+9+inch
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/48ebd6c76.pdf
    • https://dujomimip.weebly.com/uploads/1/3/6/0/136086420/xofop_nakavukipog_bimaruribezora.pdf
    • http://fesotisifofil.mygamesonline.org/nijenugifipagofebomexax.pdf
    • http://rebezun.mygamesonline.org/90703768138.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/4f9de9fb-918e-4972-b7bb-46fcab0817ca/95919946564.pdf
    • https://s3.amazonaws.com/nisoxow/gudivada_weather_report_come.pdf
    • https://uploads.strikinglycdn.com/files/74069ee3-07e2-40ec-9680-7f41b695bf40/rawibevumogobiniwut.pdf
    • https://s3.amazonaws.com/jolituzoji/7933333970.pdf
    • https://s3.amazonaws.com/jevelel/kofojosemasozulowe.pdf
    • http://zisukuvi.atwebpages.com/diary_of_wimpy_kid_dog_days_book_summary.pdf
    • https://uploads.strikinglycdn.com/files/2136ede8-8544-46e2-bd38-b681fdc8ba30/comparison_between_air_standard_cycle_and_fuel_air_cycle.pdf
    • https://s3.amazonaws.com/vuraradaso/40064499734.pdf
    • https://s3.amazonaws.com/rakabexozu/batudixulipevedat.pdf
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_2fc34ca258934d8eaea3287f99342169.pdf?index=true
    • https://uploads.strikinglycdn.com/files/39718a5e-6d93-42cb-a2c2-c4eb6fba2ae5/18294765723.pdf
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_5fefe8bb2c2f436fb6da34546ce2e7ad.pdf?index=true
    • https://s3.amazonaws.com/setigafat/why_is_space_important_in_interior_design.pdf
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_1f6b97ec65654a568f5667e4e51f32b2.pdf?index=true
    • https://s3.amazonaws.com/gonima/cover_letter_template_for_sales_manager_position.pdf
    • 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_off00010d11.bin
2887ac768318e02a62279cedc23a15356752e545a1b6dfa47ecdd6537ed45770		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D11 4936 bytes
font_01_sfnt_off00011dc1.bin
1ab88a0612ea2665dca712e30975008553b40f7692cc2fdcd2926fae3b1f3863		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC1 11096 bytes
font_02_sfnt_off00014379.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14379 4324 bytes

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