Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2255597a31e8d5b…

MALICIOUS

PDF

108.4 KB Created: 2021-03-04 02:29:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e0592aac4de18cee595acb25e6762b85 SHA-1: a9e7f0ad7e8cb131f1fef550d6ddb8649225dcc4 SHA-256: d2255597a31e8d5b78aa64bc89ed7cdcd19f78e028c387338576873ba50b5b0b
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, including detections for malicious redirector links and a link farm. The document body, though heavily obfuscated, appears to be a lure related to "A doll's house by Henrik Ibsen", with numerous embedded URLs pointing to potentially malicious or disposable hosting sites. The primary attack pattern involves directing users to these external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=a%20doll In PDF document text
    • https://lekofubazag.weebly.com/uploads/1/3/1/8/131872104/aa5de74f122.pdfIn PDF document text
    • http://wovuwukotuvoxi.mygamesonline.org/dosetavuk.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/how_to_use_bands_for_abs.pdfIn PDF document text
    • http://zawomuxe.iblogger.org/florida_east_coast_surf_fishing_report.pdfIn PDF document text
    • https://ludolukek.weebly.com/uploads/1/3/4/6/134699908/kapaxuzasom.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/whats_the_best_motor_for_a_zero_turn_mower.pdfIn PDF document text
    • https://sonoredepi.weebly.com/uploads/1/3/0/9/130969061/c2f862ec935e80f.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/66444732649.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/70745139077.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/flavors_menu_dunkin_donuts_names_with_pictures.pdfIn PDF document text
    • https://vixodago.weebly.com/uploads/1/3/4/7/134716619/8079320.pdfIn PDF document text
    • http://bokugezus.66ghz.com/53069339149.pdfIn PDF document text
    • https://pemolodubi.weebly.com/uploads/1/3/6/0/136052155/125467.pdfIn PDF document text
    • https://sobomimaseneke.weebly.com/uploads/1/3/1/3/131379860/lopupadik_bunavukaza_xazunupir_sevoxekojivo.pdfIn PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/cef385794d.pdfIn PDF document text
    • http://bewerab.22web.org/wodariba.pdfIn PDF document text
    • https://kemosufasegu.weebly.com/uploads/1/3/4/3/134348140/7876837.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/10576196952.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/navukud.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bedekopezedegej.rf.gd/barimuvipexolunusiti.pdfIn PDF document text
    • http://jadivepijuga.myartsonline.com/3983027727.pdfIn PDF document text
    • http://xifimerin.onlinewebshop.net/tecknet_keyboard_keys_not_working.pdfIn PDF document text
    • http://vubukenod.rf.gd/2009_ford_escape_pcm_problems.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
stream_004_off00016bf5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16BF5 4484 bytes
SHA-256: 0548bef71e9df57de6225199296fb6d2b9fc53fe3d11aacb940eac67131043c0
font_00_sfnt_off000159cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CC 5392 bytes
SHA-256: b060f54bd6f05062d6eb33e40f67072659120ecaf4759fffc330e276ff0d9a91
font_02_sfnt_off00017c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C70 11724 bytes
SHA-256: 5247e22c440b32a10eb6b1d44206332f08f0da111b6bc17900710102d46d66c0

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