Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fb6e7ca250c8e2…

MALICIOUS

PDF

69.3 KB Created: 2021-02-21 01:51:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f56a5ee297f14b0eacb5ae3b63ab391d SHA-1: fed571a2cfa2a4b490ec52350101a2ddbe604269 SHA-256: 41fb6e7ca250c8e2857df5b2ae6bee1cf1ae46d148a03ffe10830769fe7e3fb9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a "link farm" by heuristics. The primary external URL, https://jottigo.ru/wix?keyword=pitcher+and+basin, suggests a potential SEO manipulation or phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. While no scripts were directly extracted, the PDF structure and external links indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/wix?keyword=pitcher+and+basin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374700/normal_60255b32c6561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457570/normal_5fdc0d55150e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500201/normal_5fd8cd732559d.pdfIn PDF document text
    • https://rijozixofufake.weebly.com/uploads/1/3/4/5/134509282/e099e681c25d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412170/normal_602d50bac1a99.pdfIn PDF document text
    • https://fegajasun.weebly.com/uploads/1/3/4/5/134502742/tewabilutelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413240/normal_600b1ddf21fe2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/savifin/dreamweaver_8_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/amide_formation_from_acid_chloride.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/hotel_formule_1_champigny_sur_marne.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/how_to_overcome_force_of_gravity.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/48915024310.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/soulseek_ns_free.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/used_sheet_metal_folding_machine_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/43772973999.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_off0000d482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD482 5136 bytes
SHA-256: aa02371f0989851f330301a2d07cb8d4495122ca5ddeb24c231e59b138074376
font_01_sfnt_off0000e5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E7 10216 bytes
SHA-256: bafcda60a143a1b16b6d097ceaae7b0d9b2931df925179fe681eb7532e33830d

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