Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b75cd3ef3d2205…

MALICIOUS

PDF

104.1 KB Created: 2021-02-21 11:37:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bd7e23176fdb159fcc0650ee271ce644 SHA-1: 91ca428aba42269eb6d84c7c854a1f2a3ca5d381 SHA-256: e8b75cd3ef3d22055a240b70bcf97cfe855bf3afd1b4a337f3d24a727572855d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=explain+how+cultural+diffusion+occurred+in+mesoamerica PDF link annotation
    • https://cdn.sqhk.co/finulepaf/hdIgvHM/84522305443.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/siaOiad/16585663576.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/bja4gD0/callaway_golf_club_sets_for_seniors.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/gggjeia/xenoxamadowu.pdfIn PDF document text
    • http://fitokapss.xyz/545974889922dz6o.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/d4Ouqhi/brilliant_earth_moissanite_vs_diamond.pdfIn PDF document text
    • https://lidaleteso.weebly.com/uploads/1/3/4/0/134017218/taxifuzojakesux-kaminizujod.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/CLgjgeJ/8854566316.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/ehdwhlm/76723088234.pdfIn PDF document text
    • https://nosekixiruwem.weebly.com/uploads/1/3/1/3/131380944/681856.pdfIn PDF document text
    • https://fitulepam.weebly.com/uploads/1/3/0/8/130874207/1a21d9be33.pdfIn PDF document text
    • https://jikurufor.weebly.com/uploads/1/3/4/6/134613562/masoju_keteviweg_renufebivabusej_dunepubukavaj.pdfIn PDF document text
    • https://cdn.sqhk.co/rodofusavivi/nRiaMjj/nursery_rhymes_baby_shark_pinkfong.pdfIn PDF document text
    • https://diporatefumidal.weebly.com/uploads/1/3/4/4/134489634/a127bb3f973b.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/hdifBrA/waduvonatonuki.pdfIn PDF document text
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/tupixemogadipip.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/Gibuzhd/hello_neighbor_act_2_walkthrough_red_key.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00015971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15971 5512 bytes
SHA-256: 3507cedc29959cba98ed4702a8d81a7af64fe9abb6393dd7801f70f209fe72fa
font_01_sfnt_off00016c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C21 11656 bytes
SHA-256: f877b98e50c2d2607bfa831b640b4eb72dc0443edf6c4400842931730fd774f7

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