Malicious PDF — malware analysis report

Static analysis result for SHA-256 8faccfb1f731d96c…

MALICIOUS

PDF

72.7 KB Created: 2021-09-24 14:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d97bc8163c50f949f6a584858486ed4e SHA-1: c022e77f857ec6f0e5375ab25d201dc2a621c783 SHA-256: 8faccfb1f731d96c72aa923b5b3f04d8354a7e99ceb0d90902f6eba276173907
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to download and execute further malicious content. The presence of numerous external URLs, many pointing to PDF files on unknown domains, suggests a phishing or credential harvesting campaign.

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://bradzo-ep.com/uploads/files/39103206681.pdf In PDF document text
    • https://hizlipin.com/calisma2/files/uploads/93721254621.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/33263567244.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/bizin.pdfIn PDF document text
    • http://spiregene.com/image/files/20210924_061225.pdfIn PDF document text
    • http://gysanya.com/upload/file/210924055602791434usetk1micoi2.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/sejesejokakali.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/98498326149.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/ganen.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/97058843836.pdfIn PDF document text
    • http://herve-coiffure.ci/files/bunijagesagu.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c1df8c4feaa2d0d5045270f204ab2da2/95199710678.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/80127277461.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/68438968352.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/50949463809.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f708819d8c---41591428661.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/35470193205.pdfIn PDF document text
    • https://oasis-travel.ro/files/96946962514.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/dakodojubasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=junit+sample+programPDF link annotation
    • http://elezioni2014.gds.it/userfiles/file/lumekutoku.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://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_off0000b298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB298 19240 bytes
SHA-256: fd73fbb009b95700ff947e8a11aabacab76fb0da72e6716db69c0ace7d94c331
font_01_sfnt_off0000e4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 10688 bytes
SHA-256: b2e112ba9029f49fb6fda4fea98f3ba408410097bda8a7c83d8075768a8d1883

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