Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9d1b923f9bba93…

MALICIOUS

PDF

96.9 KB Created: 2021-03-23 23:17:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 30253b706de6865dce72ff4a066a3394 SHA-1: c9543e59ec1e9414b9f0bc6f49136c676347d30b SHA-256: cc9d1b923f9bba93862d6e048e3688707322bedfe692d1b07fd73c5120be9e8f
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of a 'download button' heuristic and numerous links suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links point towards a malicious workflow.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/wix?keyword=kinemaster+pro+apk+101 PDF link annotation
    • http://xitaboketeloba.iblogger.org/automation_direct_plc_manual.pdfIn PDF document text
    • http://kinorio5.xyz/misaxuz27zlu.pdfIn PDF document text
    • http://obschee.xyz/46857378825by03b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kulitetokap.epizy.com/bhc_full_form_in_chemistry.pdfIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_e2857fe2619e4d9a9dcc8f6ffda710ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/82738004345.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/drawing_apps_for_pc_like_procreate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58ed0e02-46fc-483b-8d1c-d7bc6aab6451/pointers_creek_cemetery.pdfIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_acc030988b21405ba69d0c287a47b4cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0eaa08a-d9d0-4809-be5f-3249cc8fcedc/mesa_boogie_triple_rectifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c7c4bae-7e2a-4e96-a425-d4b7c14ec894/37950082026.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/rulaletevu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87271793-35f8-4574-9c86-03e085e32117/63118773364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15ba0ed-55e4-41bc-a3e3-1855dea2c8fa/88286963177.pdfIn PDF document text
    • http://benepiro.rf.gd/adenovirus_canino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbfc6c7-a690-4571-bd08-9fe4fba39f38/coleman_lantern_case_canada.pdfIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_52ebdecff4bf4bf48fd1f1418ebf806e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/litizojatudu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FE 5160 bytes
SHA-256: 0e5d59339d899280663156b91355bab035e8dd2d85ce3f934793449a8272f44f
font_01_sfnt_off0001276b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 2936 bytes
SHA-256: 6f17531ec3797cf313e26761874ca74e3f48f763792f1a4fb41c8eef2a5a4583
font_02_sfnt_off0001337e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337E 11988 bytes
SHA-256: 680865523d8daf19be1f927879bb6c64ca75fdfa6e4f7bce475fdfa34cb562c4
font_03_sfnt_off00015c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C86 17604 bytes
SHA-256: bc2d3b01346e3892694f2344821dafeba52dcd1fbb0d56fa56ffa9fa2699ac06