Malicious PDF — malware analysis report

Static analysis result for SHA-256 e768f138c50933ae…

MALICIOUS

PDF

76.2 KB Created: 2021-09-14 08:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc105a945dab6257aec0bdd70c037fe7 SHA-1: 1d7800371d67e879110180a56ef54ddcb60c2436 SHA-256: e768f138c50933ae9a7a46114f9d3ddeed7192c6612a207e710f67ee1b6acfdc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a large number of external URIs, many pointing to disposable domains, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, but the heuristics indicate the primary function is to act as a link farm, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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 https://nomylo.ru/uplcv?utm_term=car+parking+multiplayer+glitch+mod+apk PDF link annotation
    • http://stphilomenaonline.org/userfiles/file/14945127798.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/61281663595.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16133662aeaa1b---narisajidojaxujije.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/sopunoropafinaxekodoxi.pdfIn PDF document text
    • https://labelmarket.eu/data/file/64621431597.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/woxusidaxigufatuzululino.pdfIn PDF document text
    • http://eichler-kammerer.de/24858319872.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/98301050993.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/gowoku.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/vuvix.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/ripejikevofo.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/44931939563.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/fukalokexasu.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/luzif.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/44281911493.pdfIn PDF document text
    • https://riwg.in/userfiles/file/tibaxalolubajikarew.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/17910966609.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/wevik.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/werovevadirapex.pdfIn PDF document text
    • http://esejsc.com/upload/files/lojetodikojomeru.pdfIn PDF document text
    • https://digireg.li/upload/38838402449.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/2322076113.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/lojunedulefebipeta.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_off0000bc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 21044 bytes
SHA-256: 61c973aeb478fa032d4581856c0aa683132e753db4593d6e72d79c7324194a77
font_02_sfnt_off000109c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C4 11132 bytes
SHA-256: 5283ddd23f354b668ac4f469ec637e3bd8a4bd155508b8e3e297655afcd71f22

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