Malicious PDF — malware analysis report

Static analysis result for SHA-256 08140e009a1e3914…

MALICIOUS

PDF

92.1 KB Created: 2021-03-25 09:36:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 00bf52a25870951b7c2455ba1299654e SHA-1: dd8e97ab5f60ccd880b499899328424d9f795e36 SHA-256: 08140e009a1e3914d11bf4b1f67e0a53f6a21bf776dcac6012a5a33b2ffe4e3e
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, including a prominent one to 'gimoguvi.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links pointing to external PDFs, and 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords that appear to be used as lures.

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.
  • 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://gimoguvi.ru/wix?keyword=football+team+in+royal+oak+michigan PDF link annotation
    • http://summ-green.fun/iebc_job_application_form_for_temporary_employmentcfbwg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472775/normal_5fe5a6290abd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420907/normal_600907ced7e59.pdfIn PDF document text
    • http://itwow.info/geluleseli6k5ln.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476001/normal_601297e00220d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386084/normal_5fe30a5441c83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369776/normal_605c03d7deb42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421778/normal_60583e5c5c5f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_60193632cd8e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455883/normal_5ff62515e86c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_86c18c6a9d8d452dbdecbb0a9c908eec.pdf?index=trueIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_d98a9637ad3c45a49a9ebbf243161181.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/brochure_background_design_free.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_50107603496e486fb6833f12be239abf.pdf?index=trueIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_ad83175d610d4dd0a3385491bdf5b53b.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_off0001295e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295E 5296 bytes
SHA-256: 5df6d09e9679160319fcd65fb2f7aa2ff17584edf5aa0bf8d895df9f7e21b80c
font_01_sfnt_off00013b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4C 11732 bytes
SHA-256: a417b35a4382c722e1d012955377790df4d402a88d358ce779bdb2362bcb85a4

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