Malicious PDF — malware analysis report

Static analysis result for SHA-256 f075f63385af98d6…

MALICIOUS

PDF

74.4 KB Created: 2021-02-13 17:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4b1f7003d54408298cd3f7fc6893608f SHA-1: d599d4046730442279a160a1492d33a54412d3ad SHA-256: f075f63385af98d6612181167f73ea37a86f166d0247233f55f6e2bebf568c1e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'piano sheet music'. No scripts were extracted, but the presence of numerous external links points towards an attempt to redirect the user to a compromised or malicious site.

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
  • 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.
  • 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://jacksth.ru/aws?utm_term=faded+piano+sheet+music+alan+walker PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382423/normal_5fe382dc35084.pdfIn PDF document text
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/2869167.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/iy0BPgd/blades_and_rings_android_game.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/hcihVUb/63561936438.pdfIn PDF document text
    • https://cdn.sqhk.co/lopumilekana/tutjeih/90326177979.pdfIn PDF document text
    • https://cdn.sqhk.co/katafojedul/3flmZgc/w3schools_css_animation_rotate.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/tojfjjd/noon_payment_methods.pdfIn PDF document text
    • http://iuts.space/lokelazfk8al.pdfIn PDF document text
    • http://usacreditcheck.info/avant-_garde_music_derivative_formsknub4.pdfIn PDF document text
    • https://xufizuwerab.weebly.com/uploads/1/3/0/7/130738786/3772074.pdfIn PDF document text
    • https://cdn.sqhk.co/girolivudafo/cgeK6oA/nupezolovidavekolufe.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/iphfjjk/98168491219.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/hrgdyje/newsnow_arsenal_transfer_news_live.pdfIn PDF document text
    • https://kedumapeba.weebly.com/uploads/1/3/4/5/134593926/2ac3e085eecd93f.pdfIn PDF document text
    • https://cdn.sqhk.co/mimofeto/dhjWK6w/smart_prepaid_promo_call_and_text_30_days.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/wazagidonux/glock_17_gen_4_guide_rod_assembly.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/fofibuwovuzivapet.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/68583794778.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/25253890437.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_off0000e16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16D 5424 bytes
SHA-256: de241ee31006cf5c4540e8c43bf4c9fee7668572558b6e6c7ced06277ed0d550
font_01_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 11428 bytes
SHA-256: ee21be8f91acc96fdd99503d72c1ac24e689298a81d569199dc1c7a7ac0e96a7

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