Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ba235454d15a72…

MALICIOUS

PDF

80.9 KB Created: 2021-02-25 00:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c18ae742efaff00871829d3720a524bf SHA-1: 96e08f6e2f53977421a0ba7ddf07cea13975eee4 SHA-256: c4ba235454d15a721534da76b963a2eec5dd1e56652fdaa7e2a19061c1a257a4
156 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/123?utm_term=samsung+s4+mini+phone+unlock PDF link annotation
    • http://gnoogle.site/lippincott_pharmacologyy2ofy.pdfIn PDF document text
    • https://penopamez.weebly.com/uploads/1/3/4/4/134496097/natinujipefudubitise.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/jafopixakasim.pdfIn PDF document text
    • https://tupemewona.weebly.com/uploads/1/3/0/7/130775182/a1ee9b32bdf8.pdfIn PDF document text
    • https://tolawururajetam.weebly.com/uploads/1/3/4/8/134883146/5345454.pdfIn PDF document text
    • http://seplafond.xyz/16207733109senbv.pdfIn PDF document text
    • http://small-italy.space/doodle_god_blitz_apkretm2.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/jixovabakanaguxakusogojo.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/dazinibonofobi/historia_universal_jose_rodriguez_arvizu_3ra_edicion.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/90440505050.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/electric_hand_saw_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/gixebifasifudajobu.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/kumepumevibivuloxifarad.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/61119680867.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_off0000fd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD65 5508 bytes
SHA-256: 988fec0da447b115ec7dc3470ea00437d4a3afeeefe3ea1bd53ea3c395f78771
font_01_sfnt_off00011005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11005 11424 bytes
SHA-256: cfe1453da54171a5c15fb25b2e649c25876b8feac70be9efc1f6ea7dcafc3f3f

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