Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ba02c83f7830c1…

MALICIOUS

PDF

66.1 KB Created: 2021-03-19 12:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6b45f3263ea3d5ec4a3a36f02420ee1e SHA-1: 43f68db1625ed0df92c2e2a32569103e117b2df6 SHA-256: 30ba02c83f7830c19e430bc5f70b4999fc0ee092606410b8787f0297d743edfb
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external URIs. The PDF document itself is heavily obfuscated, but the presence of multiple links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a phishing or malware distribution attempt. The embedded URLs point to disposable hosting, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://resalured.ru/123?utm_term=karimangalam+weather+report PDF link annotation
    • https://bipejazikapidim.weebly.com/uploads/1/3/4/5/134529651/182655.pdfIn PDF document text
    • http://gizaxeredemuni.22web.org/67055729473.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/36846346201.pdfIn PDF document text
    • https://jononosafopobof.weebly.com/uploads/1/3/4/6/134649788/fb271ec.pdfIn PDF document text
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/mexavira.pdfIn PDF document text
    • https://pasiwuguvode.weebly.com/uploads/1/3/4/6/134601834/jilozego.pdfIn PDF document text
    • https://bamiwesuwo.weebly.com/uploads/1/3/5/3/135390748/1797246.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutowede/fig6ghj/75461903084.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/gulapuwikowowupuxonefuti.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/qCFbfIF/free_funeral_program_brochure_psd_template.pdfIn PDF document text
    • https://cdn.sqhk.co/nokodexuxof/hicZjb5/pumariledemixinewuwokar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/049ce483-758a-4aa5-9fb1-0e2f882bc6cc/how_to_find_what_breed_of_dog_is_right_for_me.pdfIn PDF document text
    • http://jekalabol.epizy.com/sepse_neonatal_sbp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14bc9f32-033f-4de9-beac-c8d928e80f37/46258445835.pdfIn PDF document text
    • http://dodujis.epizy.com/bahubali_3_3gp.pdfIn PDF document text
    • http://kulekedeziwab.epizy.com/jobikexakuno.pdfIn PDF document text
    • http://sosujogi.epizy.com/the_little_mermaid_original_story.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_off0000c998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC998 5116 bytes
SHA-256: 26295b74e8f3261c272f18d0c0461065f5705f46ffd4a77fbe2c3f5f8bdb0592
font_01_sfnt_off0000daeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEB 9600 bytes
SHA-256: 1f8071ed5845b3e761b0b1e47b5b2a8902e59e611c78c798e15c42af6ac2e8e7

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