Malicious PDF — malware analysis report

Static analysis result for SHA-256 8215231f28e0742e…

MALICIOUS

PDF

77.4 KB Created: 2021-02-20 15:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5f4ccea015881aa1e67ae37293862687 SHA-1: b4e94a348ce9c86e51f299cf4bc55b108ef8c513 SHA-256: 8215231f28e0742ec236f6795c6c44c89db2d4d2d0284cb07a1871fcbdfe2530
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and a phishing/malicious document. It contains a large number of embedded URLs pointing to various domains, many of which are likely disposable or used for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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/wix?keyword=a+fine+fine+school+worksheets+pdf PDF link annotation
    • https://mavekajokirusap.weebly.com/uploads/1/3/1/4/131437454/401601.pdfIn PDF document text
    • http://mstmail.space/35219028537r4zmd.pdfIn PDF document text
    • http://milanbeach.fun/wilogarivumefoxobomipa4ejq.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/dQhaVha/teniku.pdfIn PDF document text
    • http://wapazezaduv.iblogger.org/dufobulufakixid.pdfIn PDF document text
    • https://sisebixa.weebly.com/uploads/1/3/4/6/134625325/sokum.pdfIn PDF document text
    • https://cdn.sqhk.co/dulidara/jgiaia9/monument_valley_game_pc.pdfIn PDF document text
    • http://dkmz1.club/holy_quran_english_versionx6pf5.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/hdiigcQ/57444259044.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/ghgighf/juventus_vs_barcelona_channel.pdfIn PDF document text
    • https://xozavefo.weebly.com/uploads/1/3/4/0/134018900/setuxo-ganaduvema.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwilaj/hdiejjk/black_and_yellow_iphone_wallpaper_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/Ogfhihh/33829764312.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://midelex.epizy.com/bofawunonenajuzujivexi.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/duvejebobuzene.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/nj_drivers_manual_hard_copy.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/cara_vsco_cam_fullpack_gratis_2018.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/avira_antivirus_free_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/idle_poring_mvp_pet_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE563 4968 bytes
SHA-256: 857ebd87c50d14c151837f0b750d591eb07872698f19c0c7185331803d650c7c
font_01_sfnt_off0000f64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 10572 bytes
SHA-256: 0a75209275e6f21cd911b2eb193a81f7f59b9a81e543df7b3078045a6ca9606d
font_02_sfnt_off00011a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A58 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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