Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6e4493ef06fb6f…

MALICIOUS

PDF

74.3 KB Created: 2021-01-12 12:42:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7a7311527e9939492d0edde97a14aec1 SHA-1: 9317478b4fde279dfb27aefd350b536aa431fecf SHA-256: 1a6e4493ef06fb6fd29643c68103dad8ccbc8e8ec7b80e62914c73cd5438abbe
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-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://traffking.ru/aws?utm_term=maths+worksheets+year+10+free PDF link annotation
    • https://site-1171149.mozfiles.com/files/1171149/wevojat.pdfIn PDF document text
    • https://site-1166708.mozfiles.com/files/1166708/brahmachari_movie_songs.pdfIn PDF document text
    • https://site-1175023.mozfiles.com/files/1175023/sikesevix.pdfIn PDF document text
    • https://noxepelobisuse.weebly.com/uploads/1/3/1/8/131871648/3655500.pdfIn PDF document text
    • https://site-1178729.mozfiles.com/files/1178729/apache_poi_android_studio.pdfIn PDF document text
    • https://cdn.sqhk.co/mewidexe/Libgfig/drag_racing_club_unblocked_games.pdfIn PDF document text
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/308422.pdfIn PDF document text
    • https://bupulaserora.weebly.com/uploads/1/3/1/4/131437689/korojurele.pdfIn PDF document text
    • https://site-1178275.mozfiles.com/files/1178275/vukiga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jufowokedunod/bapexafixuxupoza.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/instructional_fair_inc_answer_key_if8765.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/red_flag_warning_california_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/sentence_and_fragment_worksheets_with_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/vukujidor/botim_for_pc_apk.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_off0000d9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B4 4916 bytes
SHA-256: 9cb91a117b843a2451b65aad8afdf950dceebbb3c1723abd20a3cb7111fdfe8c
font_01_sfnt_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 10428 bytes
SHA-256: 1ba8fa18997ee176b60ee13c43672c652155db98755817b780a468acf4126809
font_02_sfnt_off00010e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E46 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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