Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb9a918aaf47efb…

MALICIOUS

PDF

51.3 KB Created: 2020-11-09 05:05:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 7c8120abbf9ebc4ce99d19f7d85882be SHA-1: a9182edaeda5653b149231e797adef1f56f1ded9 SHA-256: 1fb9a918aaf47efbc12d67d901981366cb16cd105e7f0139fe4ddb0bb490500f
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffi.ru/aws?keyword=denver+mattress+black+friday+2019 PDF link annotation
    • https://fukubumo.weebly.com/uploads/1/3/4/0/134016705/zomubisemorig-kizorade.pdfIn PDF document text
    • https://sijaxidav.weebly.com/uploads/1/3/4/4/134499987/kilosaxuzavag_vepafemoruje_rerabi_sidekeredi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f99f0e8c9132.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://uploads.strikinglycdn.com/files/251bc505-05a6-421d-82b7-82bdc0ebc625/tv_guide_redding_california.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/integrated_mathematics_volume_2_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e2900a-50d4-4971-9a71-c738e859925f/zerijuninanadogiwejawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/080e9e3d-a2ce-46fd-a695-7a79a997139e/football_manager_2014_nosteam_downlo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d2abc3-4148-42ae-b4b5-4b00d58bc006/gameconfig28add-on_crash_fix29.pdfIn PDF document text
    • https://xivesepolila.files.wordpress.com/2020/11/30877645579.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/necessary_and_proper_clause_ap_gov_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/81468299167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc3651e-4b73-4a65-9349-55b607b669ff/dimatemepe.pdfIn PDF document text
    • https://zodigofu.files.wordpress.com/2020/11/62877054926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f49c05bb-1254-498c-a96d-08fa450c3a22/38107563927.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78A8 5692 bytes
SHA-256: 5025d1ff862b5902c61407db30db49eb4e44378a8156788add9e45e28fd62f5e
font_01_sfnt_off00008bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFC 11156 bytes
SHA-256: f59b690f8d7e48d81c1ea6098e1a7daa1a2388b6301b8f1110587246ab374925
font_02_sfnt_off0000b1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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