Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb2cd89747d0b5a…

MALICIOUS

PDF

71.2 KB Created: 2021-01-31 21:56:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b86c1e8f3184163c567ff4f3f1aefadd SHA-1: 2d460bc4f34c51e11b922a45f54d32f0cfd75b24 SHA-256: ddb2cd89747d0b5aaa419dbd89024190146ddaaa601dfe2b2ebf876f94daeaad
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs suggest an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jacksth.ru/aws?utm_term=lucid+dreams+sheet+music+free PDF link annotation
    • https://cdn.sqhk.co/datolabevev/aijgfsK/christmas_coloring_books_near_me.pdfIn PDF document text
    • https://tinuwese.weebly.com/uploads/1/3/5/3/135300683/nibafuvudalumexivasu.pdfIn PDF document text
    • https://cdn.sqhk.co/riketumes/ihjcjak/princess_pixel_art_sandbox_color_by_number_drawings.pdfIn PDF document text
    • https://joxalazugadono.weebly.com/uploads/1/3/1/4/131437099/bizavubazowupomujozu.pdfIn PDF document text
    • https://wisetigu.weebly.com/uploads/1/3/4/3/134357320/a55aa5c.pdfIn PDF document text
    • http://mimawusavap.iblogger.org/gusotamujejisefajujoru.pdfIn PDF document text
    • https://cdn.sqhk.co/vixokezafafu/hcicgg6/ragdoll_achievement_1_hacked.pdfIn PDF document text
    • https://kutowovazamil.weebly.com/uploads/1/3/4/3/134362820/dozukexezupobit_xofif_kovapager_guvuvukux.pdfIn PDF document text
    • https://cdn.sqhk.co/doxurozupu/pGjiAhc/memomimowalerededu.pdfIn PDF document text
    • https://cdn.sqhk.co/junulevi/jnhajjI/bonimubaresujita.pdfIn PDF document text
    • http://zalofamanaw.22web.org/emergency_contact_cards_template.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/mukutud/88650179019.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/2015_toyota_camry_se_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/ender_s_game_dialectical_journal_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/75707133593.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/biblical_names_with_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/edhesive_answers_unit_2.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/pamefaguvika.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/brigandine_iso_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/cryptography_for_dummies_ebook_free.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_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 5172 bytes
SHA-256: cbe3d96483aa30f1dc3e4351cc596e9df8126283efada69c483d2792d3391382
font_01_sfnt_off0000ec70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 10140 bytes
SHA-256: 7f3c5a2f9b24149c5a20b1dddf3fb710f96eeb045b2eac39042e05c8b35b5dea

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