Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28dbb5d47449795…

MALICIOUS

PDF

74.3 KB Created: 2021-02-25 18:39:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ab359b4453eabe4b7191f607869af0de SHA-1: 4fb83fe375184f75056f1427ae629a166ef6761a SHA-256: d28dbb5d47449795f1a6978cef457aa6241cbe741d1d672ec7f808722ed54c68
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to malicious content.

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://maypoin.ru/award?keyword=what+is+development+biology+embryo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5fd217587666f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_601acced40a64.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/what_is_the_theme_of_sons_and_lovers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_6013f02ab7b14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_5fd3b2ae19df1.pdfIn PDF document text
    • https://durafozo.weebly.com/uploads/1/3/0/7/130740533/7deae768.pdfIn PDF document text
    • http://jorowijedo.mywebcommunity.org/what_happens_at_a_reiki_attunement.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489848/normal_602ae721927c7.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/b1777d2214d9354.pdfIn PDF document text
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/wutatepu.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/7450611.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/how_to_show_a_voided_check_in_quickbooks.pdfIn PDF document text
    • https://zofumevovuve.weebly.com/uploads/1/3/0/8/130874077/sanejizezasevog_dalasujufona_futimajef_wuguduso.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/9912701655.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373997/normal_5ffa744c2a478.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/braun_thermoscan_manual_6013.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_off0000e447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE447 5688 bytes
SHA-256: fa6ad6f0f299417c1e816078c3de098f6032d4f2a22f6346b1418d73a3dba9ca
font_01_sfnt_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 10764 bytes
SHA-256: 02a3c8dcfb39b1cc6df295985d68970c7359f241fa5989af97947cb47e9e544b

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