Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bd991ae2828b1a…

MALICIOUS

PDF

71.2 KB Created: 2021-02-11 18:59:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: bb3258ea6d2e3660b88ef541511c5a11 SHA-1: 2798c3bcbe76086c918a40ee2d615202a34b26d4 SHA-256: 88bd991ae2828b1a6780818ee8d3b39421936ead247397bd536c01b3dcb34fc2
254 Risk Score

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=gina+wilson+geometry+answer+key+unit+4 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4403959/normal_5ff4fd8e8e2aa.pdfIn PDF document text
    • https://vurodotug.weebly.com/uploads/1/3/1/4/131454057/335a202419e9a74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418579/normal_5fffb15a3ab20.pdfIn PDF document text
    • https://vimedapajabapi.weebly.com/uploads/1/3/5/3/135309909/4527152.pdfIn PDF document text
    • https://soresewo.weebly.com/uploads/1/3/1/0/131069968/2626240.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384159/normal_5ff79028dc202.pdfIn PDF document text
    • https://nejuxudukekiti.weebly.com/uploads/1/3/0/8/130874136/1059500.pdfIn PDF document text
    • http://zuragaretezi.iblogger.org/misolalovodavepijo.pdfIn PDF document text
    • http://nozafonavuf.iblogger.org/26212146685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480149/normal_5fdc4c78793dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485703/normal_5fecb758a3165.pdfIn PDF document text
    • https://cdn.sqhk.co/lukedivibeb/dGSChap/glass_car_shifter_knob.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
    • http://sexikiti.epizy.com/brushless_synchronous_generator.pdfIn PDF document text
    • http://dumudolaba.epizy.com/phn_mm_ct_ghp_file_free.pdfIn PDF document text
    • http://fixobijuruloluk.rf.gd/29224235479.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_off0000c8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A6 5264 bytes
SHA-256: 90d8135651ae2dbbad106c5cc3894e26c50fee408fef3ce4986d7a5c7e408301
font_01_sfnt_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 11856 bytes
SHA-256: a55c21fbab8bb5ed23d018ce39a0154d4f7ed3e568f59152cac8fb92798919d7
font_02_sfnt_off00010177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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