Malicious PDF — malware analysis report

Static analysis result for SHA-256 164e5c935e8e840e…

MALICIOUS

PDF

68.6 KB Created: 2020-12-17 20:26:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b19d354713409ae0e1f277f10b959048 SHA-1: 1060a45abf7344f3de34976553e995daf43d4eb9 SHA-256: 164e5c935e8e840ef8ca3a022efb7e57ca175c0fb32778e03ab9f16e79c87831
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://trafffe.ru/123?utm_term=the+armor+of+god+priscilla+shirer+pdf+download PDF link annotation
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/burolowe-zesogetot-vototowivezux-bizimexudolova.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/julexekubaj/tunidumalerozedo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f522264c-9ffc-4424-b256-278bce2133e3/teselunogunivajame.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50fc0f7cf8c75404597f1/t/5fcaa6cd1694195faaa63494/1607116493790/77526198256.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/29492444630.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/73082930914.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/libijetexabi.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/vixurifaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b85f3d72-94ca-42dd-b2dd-46c10fc6ee38/tasubanorofevotupojefe.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/18871643838.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc786a281fec0096842acc0/t/5fce97bfeae0215b6dc07943/1607374783946/diy_tabletop_christmas_decorations.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/tafusenuzuvira.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5045d2e537a05ef237332/t/5fd5f47d5488895576a08738/1607857278022/math_worksheets_multiplication_printable.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc306b292c50b1a1e856a3b/t/5fc84358d17d55300fa7c83a/1606959965377/panzer_platoon_mod_apk_android_1.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/spreadsheet_maker_in_mac.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_off0000c424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC424 5612 bytes
SHA-256: b15e77b9b71c2bd899a0cd907b2bf9ea76b3098071ed8fe68cb2425cdccbe615
font_01_sfnt_off0000d71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000dfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 10992 bytes
SHA-256: 3621cd5e5895e8cb14100d00618666b71664612fc8a215a511c87ac3534d5b63

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