Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f38b4461fd21593…

MALICIOUS

PDF

73.4 KB Created: 2021-02-22 11:20:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e23a85116543bcc958067f8fd0359ba1 SHA-1: 405028e98c34cb1395a89f7a8a7cab2a362ac22b SHA-256: 2f38b4461fd21593f7c258a149997670a18d116fceb25479a1984e8e1cff0143
192 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a critical finding for a link to known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to downloading software. The presence of embedded URLs and the ML classifier's high confidence score further support the assessment of a malicious document designed to trick users into clicking deceptive links.

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 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://crophysi.ru/wix?keyword=lego+jurassic+world+apk+free+download In PDF document text
    • http://tazijiga.22web.org/gisixe.pdfIn PDF document text
    • http://originalhallyu.com/california_dmv_commercial_driver_handbook_audiov40mw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457590/normal_601b378bd53dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497369/normal_5fe0e3b4c4238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422638/normal_6032f44cd6d3c.pdfIn PDF document text
    • http://xisalokowifob.22web.org/backuptrans_line_iphone_to_android.pdfIn PDF document text
    • http://ibkreactiva2020.com/ck2_organize_raidw3bju.pdfIn PDF document text
    • https://warapado.weebly.com/uploads/1/3/1/4/131437563/ef483fcc86.pdfIn PDF document text
    • https://xeraxoxatetubus.weebly.com/uploads/1/3/5/9/135993523/882073.pdfIn PDF document text
    • http://fanexaxujuto.22web.org/kenmore_elite_washer_wont_drain.pdfIn PDF document text
    • https://nitavadokeja.weebly.com/uploads/1/3/1/1/131163909/makaxupexegusiz.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/kezemiradigu/26202416172.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/correct_goblet_squat_form.pdfIn PDF document text
    • http://lodavudomajip.epizy.com/90607435962.pdfIn PDF document text
    • http://vorawaforase.epizy.com/android_10_release_date_for_oneplus_6.pdfIn PDF document text
    • http://malosebetu.epizy.com/sowelerude.pdfIn PDF document text
    • http://bosulug.epizy.com/95377795646.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_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 5496 bytes
SHA-256: 8dbc6cb2474f47c0f877d62d75fd1d9d1701be9dbaceb2c03353e57b565bf96a
font_01_sfnt_off0000f370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF370 10760 bytes
SHA-256: 5717e76169ab10485b3ea14b60aee8cd92e30b12a22fd31d72e8939f85aa5254

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