Malicious PDF — malware analysis report

Static analysis result for SHA-256 8634a9b3146ac293…

MALICIOUS

PDF

85.6 KB Created: 2021-04-23 20:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c04b7c797b51fd2d789a328ae84dae56 SHA-1: e9e8ced097e4b7b24193a6a2fb3f3bde38aeb5c9 SHA-256: 8634a9b3146ac2935388963554094ba9247279cc8728e0b4b77c92d16b9af6be
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing users to external sites. The presence of numerous links and disposable hosting suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=what+is+it+called+when+a+vampire+controls+you PDF link annotation
    • https://tadilagene.weebly.com/uploads/1/3/1/3/131381422/bawemalezuvedola.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/bertrand_russell_autobiography.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472788/normal_60676091c5464.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/suwuk.pdfIn PDF document text
    • http://zovitidagawas.sportsontheweb.net/41185635469.pdfIn PDF document text
    • http://kejurudoji.medianewsonline.com/boat_trailer_bill_of_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378406/normal_6058c84ca0d94.pdfIn PDF document text
    • http://slimerecipe.org/23815361067fapva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460975/normal_6056a970c18fd.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/eyelash_extension_course_jacksonville_fl.pdfIn PDF document text
    • http://xupokaxe.medianewsonline.com/toa_120_watt_amplifier.pdfIn PDF document text
    • http://mosquito.codes/lusodut4q833.pdfIn PDF document text
    • https://ziluxokoker.weebly.com/uploads/1/3/4/3/134392919/mukawapevajog_vajoliwuloxesem.pdfIn PDF document text
    • http://accueilcmb.com/velodiwejododogef530a.pdfIn PDF document text
    • https://tolaguse.weebly.com/uploads/1/3/0/8/130814280/gateguwo.pdfIn PDF document text
    • http://towonededuv.medianewsonline.com/garrett_ace_250_manual_cz.pdfIn PDF document text
    • http://unreguezff.rest/duplicate_google_sheetuzhmw.pdfIn PDF document text
    • https://wamabiror.weebly.com/uploads/1/3/1/1/131163705/daxinusobexitelefexa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498834/normal_5fec3a825ec7b.pdfIn PDF document text
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/bevepepobasapanesu.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://rujidafedisezu.atwebpages.com/all_amendments_in_1973_constitution_of_pakistan.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/figma_login_template.pdfIn PDF document text
    • http://defakulid.atwebpages.com/ansys_fluent_19._1_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/79250669634.pdfIn PDF document text
    • http://moxosutemow.onlinewebshop.net/suvekepelototixuto.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_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 5460 bytes
SHA-256: 15cd8490425a42c050ab72bc4f5f225952cc652039d3475ffa2afe898aace090
font_01_sfnt_off00011626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11626 10488 bytes
SHA-256: ae11bd2d2461c4529ff0c203172c97b0004d7ec633ed435c43795c1afe74ee27
font_02_sfnt_off000139ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c