Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff874c0e4d7a806d…

MALICIOUS

PDF

105.2 KB Created: 2021-03-22 21:21:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4b201dfcef46d2dc510a3d3a9c515c8f SHA-1: 96a62fc21187d8b27cd2d45e758eaf28151f08fa SHA-256: ff874c0e4d7a806d401d3a03c2f50deb28e2d6adeb16a352333bfea1acbe5b6e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://midufefew.ru/aws?utm_term=truy%25E1%25BB%2587n+ki%25E1%25BB%2581u+vi%25E1%25BA%25BFt+b%25E1%25BA%25B1ng+ti%25E1%25BA%25BFng+anh PDF link annotation
    • https://tigigedilopufam.weebly.com/uploads/1/3/5/4/135400960/nuvixerevukad-wopotaluruna.pdfIn PDF document text
    • https://pizeposinejuxow.weebly.com/uploads/1/3/2/6/132695365/jijubarez-jexajub-sisufu-zawunoweke.pdfIn PDF document text
    • http://fazoluniguket.iblogger.org/forklift_certificate_template.pdfIn PDF document text
    • http://lovasosirukes.iblogger.org/19107561033.pdfIn PDF document text
    • https://tatedugede.weebly.com/uploads/1/3/4/3/134311852/fusapofesumu_gexowuv_nebabesete.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/jhjhgu6/moto_racer_15th_anniversary_apk_full.pdfIn PDF document text
    • https://cdn.sqhk.co/xafeperale/jyDnjc8/bombas_hiking_socks_reviews.pdfIn PDF document text
    • http://pofudaw.iblogger.org/how_to_do_binomial_expansion_without_pascals_triangle.pdfIn PDF document text
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/durudevusufum_waxelore_ximukexunaled.pdfIn PDF document text
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/041fa.pdfIn PDF document text
    • https://cdn.sqhk.co/nilesatu/jiiXRjg/bein_sports_directv_puerto_rico.pdfIn PDF document text
    • http://zorugukuremired.22web.org/archaic_greece.pdfIn PDF document text
    • http://vaxiguna.iblogger.org/op_amp_circuits_tutorial.pdfIn PDF document text
    • https://famogapev.weebly.com/uploads/1/3/1/6/131606489/pitewisis-tepez.pdfIn PDF document text
    • https://zuwexonoporij.weebly.com/uploads/1/3/5/3/135317719/rebowu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_ae13f0895deb4c1fa6b61840226876c4.pdf?index=trueIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_2765216c09ba47d29e6ff04101d6a1b0.pdf?index=trueIn PDF document text
    • http://noxofovamoz.epizy.com/31055539424.pdfIn PDF document text
    • http://sipawas.epizy.com/wiwebedokogaz.pdfIn PDF document text
    • http://wavivexudis.epizy.com/24360322388.pdfIn PDF document text
    • http://wuwalumawaj.rf.gd/wodit.pdfIn PDF document text
    • http://sarowagilujet.rf.gd/33502814942.pdfIn PDF document text
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_9813bb777fb243b29104cddbece3a165.pdf?index=trueIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_3d7f859b37e2449eb0d705bb7a5caae2.pdf?index=trueIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_1e6eff6b514a417c8aeedec93c760fa3.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13767 5848 bytes
SHA-256: d63a0639390121d3b4fde70951db760fd75d979111e6998db8a87f86faaddda9
font_01_sfnt_off000149df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DF 24528 bytes
SHA-256: 4d418081d9a309055dc949382793bcc21cb198bc4c082f2afc540683515446fa
font_02_sfnt_off00017f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F41 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e