Malicious PDF — malware analysis report

Static analysis result for SHA-256 e803cb4b7cdc9789…

MALICIOUS

PDF

165.3 KB Created: 2021-02-22 13:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c3488fad223ce02f124017469b698e2a SHA-1: 7fda13c68332307973bc47e95b4ee35092f4bcd1 SHA-256: e803cb4b7cdc9789d92a5ee1595edd37a0b6fb887e10bdec151f41febba34b9d
192 Risk Score

Malware Insights

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

The PDF contains multiple links to disposable domains and known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=solution+manual+for+introductory+econometrics+a+modern+approach+5th+edition+by+wooldridge In PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/lixepuw_pixuxup.pdfIn PDF document text
    • https://cdn.sqhk.co/wujugojuse/4WrRhcZ/formula_racing_car_mod_apk.pdfIn PDF document text
    • http://bigswinner.space/lake_havasu_fishing_guides1cnpz.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/3305585.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/gjdHLVw/47891843729.pdfIn PDF document text
    • http://meinekarten.best/83381190562pwjaw.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/cjdvggh/42753115691.pdfIn PDF document text
    • http://pihodze.com/wix_logo_maker_reviews62lo4.pdfIn PDF document text
    • http://operationhomeplate.com/440221072517q86s.pdfIn PDF document text
    • http://fusubakitakudup.66ghz.com/margaritaville_key_west_frozen_concoction_maker_with_easy_pour_jar.pdfIn PDF document text
    • http://amst-watch-v1.club/isabel_allende_el_zorrohwl5h.pdfIn PDF document text
    • https://tulofezufiruz.weebly.com/uploads/1/3/1/4/131409090/663505.pdfIn PDF document text
    • http://excellent-spb.ru/mememilammp5.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/c6hcgcd/lunuwekirunubejolo.pdfIn PDF document text
    • https://warapado.weebly.com/uploads/1/3/1/4/131437563/70b71c3b813dba7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gibivugaxuma.rf.gd/toxibokuwezawagetapov.pdfIn PDF document text
    • http://jupunefubepaza.rf.gd/40172524530.pdfIn PDF document text
    • http://jiwunix.epizy.com/botilogide.pdfIn PDF document text
    • http://wujerufe.epizy.com/kendo_ui_spreadsheet_angularjs.pdfIn PDF document text
    • http://rojufewi.rf.gd/95761560505.pdfIn PDF document text
    • http://zosejanukapub.rf.gd/carmen_miranda_s_ghost.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_off00024a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24A83 6128 bytes
SHA-256: 279ab28623a8329bdc11854686d0ec63781af19e6b7693b686826d2e57089f9e
font_01_sfnt_off00025f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25F49 12180 bytes
SHA-256: 69b556acccfd91c1af3b6f48357c72a479fc1ed92389913f80d687898791b305

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