Malicious PDF — malware analysis report

Static analysis result for SHA-256 58bca8c5997d8dde…

MALICIOUS

PDF

70.5 KB Created: 2021-06-09 06:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 30e8f11333f0da30a81113c4fbedaa9b SHA-1: a962ad0606a1387ed8aef29bab3d16ee41185dfe SHA-256: 58bca8c5997d8ddedde69112f237a01c4f237c56b551e491588505bbd6b6d3c3
194 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious workflow designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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
  • 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://smidgel.ru/pbw?utm_term=mahabharat+star+plus+flute+ringtone PDF link annotation
    • https://revawowi.weebly.com/uploads/1/3/5/3/135317167/xokege.pdfIn PDF document text
    • https://wesemijotabiwa.weebly.com/uploads/1/3/4/6/134622043/wifisoxazete-fuzugo-vakigodikur-rojegixosibi.pdfIn PDF document text
    • https://tiwozujipi.weebly.com/uploads/1/3/5/3/135317022/741471.pdfIn PDF document text
    • https://tabolobaw.weebly.com/uploads/1/3/4/7/134744426/zodujowepudoxib.pdfIn PDF document text
    • https://xamonato.weebly.com/uploads/1/3/2/8/132814301/16f85b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482424/normal_60b941e62b8e9.pdfIn PDF document text
    • https://tetemubegogik.weebly.com/uploads/1/3/4/4/134443084/9602989.pdfIn PDF document text
    • https://jatowuwovusi.weebly.com/uploads/1/3/5/9/135981640/16bf6295.pdfIn PDF document text
    • https://vawixufedal.weebly.com/uploads/1/3/0/8/130814584/gowazenujemi_zemuxovolarina_vusuzuroluxeke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486035/normal_6039bfab77279.pdfIn PDF document text
    • https://lamekibig.weebly.com/uploads/1/3/4/6/134652122/3584884.pdfIn PDF document text
    • https://petuxomurekag.weebly.com/uploads/1/3/0/8/130874153/1670628.pdfIn PDF document text
    • https://gakupimofol.weebly.com/uploads/1/3/4/5/134583622/6878004.pdfIn PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/zegiximise.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/51d80af5-d620-42af-973e-9004ef5be6b8/92357289471.pdfIn PDF document text
    • http://legesir.pbworks.com/f/frases_para_xv_aos_biblicas.pdfIn PDF document text
    • http://zixememot.pbworks.com/w/file/fetch/144733167/mitosesejirotoxujefep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d4fa5f-8bcb-4573-9fb2-b90c134330fb/88843580878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f518d086-0ed8-4d1e-94ab-9af53d8d7d02/xelijufanibiziri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23222b7c-949d-4f60-b679-808e72cc0d36/shakespeare_sonnet_18_analysis_essay.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/w/file/fetch/144528549/barrons_sat_subject_test_chemistry_15th_edition.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144585114/12720356005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd99d0c-9e40-4b07-bebf-d560753398c5/xesuretorinasavokelunexo.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_off0000d6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 5308 bytes
SHA-256: 88e77221fd8a8af4cd583902f3c45cbbb22a9b4cb37d2847e376dab1865e1b22
font_01_sfnt_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 10032 bytes
SHA-256: e6abbd7fd507c8eb0a02ee6da7255002a8d1a35d5b85c79e935a9f2ec69f25e1

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