Malicious PDF — malware analysis report

Static analysis result for SHA-256 857903b362b413ee…

MALICIOUS

PDF

86.0 KB Created: 2021-03-24 03:25:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f85973380494d274e8987a066416f68e SHA-1: cd6e1d6217667892285c4784c3359c91a1fd2f55 SHA-256: 857903b362b413ee8e2b1764dcb4fea62e129d6c6a61542f85853566de0af153
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a phishing or scam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of 'utm_term=pace+bus+tracker+app+android' in one URL suggests a lure related to a bus tracker application, aiming to deceive users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://mezovuduw.ru/123?utm_term=pace+bus+tracker+app+android PDF link annotation
    • https://gebusoju.weebly.com/uploads/1/3/0/9/130969184/luzepor_tomemele_joken_fafurubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452392/normal_603124145d27f.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/wafilewef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427094/normal_603e24321acbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_604e54a0d515f.pdfIn PDF document text
    • http://rofogukiluvupu.mygamesonline.org/caracteristicas_principales_del_modo_de_produccion_feudal.pdfIn PDF document text
    • http://kmplitka.shop/24089647672geyax.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/what_does_navidad_mean.pdfIn PDF document text
    • http://fullstacket.online/boxujupz3o.pdfIn PDF document text
    • http://gedirobidepud.scienceontheweb.net/30124363091.pdfIn PDF document text
    • http://persequen.com/marilyn_hickey_signs_in_the_heavensm3exw.pdfIn PDF document text
    • https://nugijokokul.weebly.com/uploads/1/3/0/9/130969158/3663318e8bf24.pdfIn PDF document text
    • http://pearhaidhr.fun/21345154898kvynv.pdfIn PDF document text
    • http://didazema.mypressonline.com/diabetes_epidemiologia_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419827/normal_5fe94db7da0aa.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
    • https://s3.amazonaws.com/wupuxus/4158000211.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/all_about_me_worksheet_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/lerixazageterukusore.pdfIn PDF document text
    • http://xafibejijopo.atwebpages.com/ruvawexopotemidesaxelib.pdfIn PDF document text
    • http://gapoxuvopa.onlinewebshop.net/nodirujinedijijan.pdfIn PDF document text
    • http://ginowane.onlinewebshop.net/53108056392.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_off0001043f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 5120 bytes
SHA-256: 34cbc6e4d383857c04f8220850131c6aefda678e3ce0a47e5f634f5822327a27
font_01_sfnt_off000115a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A0 11688 bytes
SHA-256: da969366779baedf43c4d9207eab4bbcc9abf63df1c43950a33c5827b7478f82
font_02_sfnt_off00013ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE2 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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