Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e27fc13fbe61125…

MALICIOUS

PDF

74.6 KB Created: 2021-02-28 05:01:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ac254517235c10005b79da4d9f67242b SHA-1: 2b81586c9a70319975f59948d46b96c9f6ee8086 SHA-256: 1e27fc13fbe61125c80ac39aa1d64fc8c334b7a2a6b7c5df1ff1fc12f495f2f6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a mass of external links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains references to product names and application details, suggesting a lure to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://zajinet.ru/award?keyword=garmin+nuvi+2797lmt+gps+navigator PDF link annotation
    • https://cdn.sqhk.co/kitujesijak/hiifcig/bus_subway_surfers_online.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/IgJidji/87511848127.pdfIn PDF document text
    • https://cdn.sqhk.co/xonoguduzob/3LibChh/vector_calculator_addition.pdfIn PDF document text
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/2048419.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/easy_tablet_weaving_patterns.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/pjajbhj/sandwich_shop_vienna_austria.pdfIn PDF document text
    • https://kuxokovu.weebly.com/uploads/1/3/0/7/130738635/botutavitodo-retijo-nipurimizutaw.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/ifNqcXz/freeze_warning_app.pdfIn PDF document text
    • https://cdn.sqhk.co/pubisifibuj/TWha8oL/96977482110.pdfIn PDF document text
    • https://cdn.sqhk.co/kiwikiza/qywSii8/darasovedawumopipewinud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/23190757061.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/free_speaker_volume_booster_for_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/toduzejivufisosuruxi.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/77603131562.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/android_application_bug_bounty.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/wedekuwuniwajuritisen.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/pukug.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/subadijejibiriwaxoxafine.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/21066554408.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 5596 bytes
SHA-256: 8438f40fe47722a301daf6773e22b88f4a000c75191232d5a81334d4f428b1b2
font_01_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 10476 bytes
SHA-256: 3ee2ee4384453cb2d29b8b80e14e48cf00e44e1ef53a7057102586197f1e2543

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