Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d8d85ac135388a…

MALICIOUS

PDF

84.8 KB Created: 2021-01-06 19:30:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a9db68d82bae457ff1a61aed457f7911 SHA-1: e3dc85d91e04b29c40c45671742398a64523de9f SHA-256: 83d8d85ac135388a6203ba045a8c4fafd6fdc7c70e7782ed82bd8a38945b823c
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, including a link farm detected by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The document body, though heavily obfuscated, appears to be a lure related to 'piano sheet music'. No scripts were extracted, but the presence of many external URIs and the ML classifier's high confidence indicate a malicious document, likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://traffset.ru/aws?utm_term=youth+by+daughter+piano+sheet+music PDF link annotation
    • https://cdn.sqhk.co/sorubajuzoxe/hdgecge/vikings_the_game_ps4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446030/normal_5f9e2ae765200.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/T13pPPO/citb_toolbox_talks.pdfIn PDF document text
    • https://cdn.sqhk.co/kupulifip/ieif9jd/halloween_decorations_indoor_party.pdfIn PDF document text
    • https://pojuzalik.weebly.com/uploads/1/3/4/2/134235388/4017155.pdfIn PDF document text
    • https://cdn.sqhk.co/nutanujel/owmiahh/pokemon_xy_tv_show_episode_1.pdfIn PDF document text
    • https://cdn.sqhk.co/waderapal/jthghfO/jaxipapokabo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528260/normal_5fdef258a241b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d027398c-a39d-463a-93e1-37b74e807533/10593076859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a388cb3b-c9fd-40f6-85b2-072d9a5f8b12/42577741374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/486e4009-9dbb-46c5-80c4-bab43a477257/death_invasion_survival_mod_apk_unlimited_money.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 5656 bytes
SHA-256: 230dc0e4d4771525cc3c2fc119cf2329360137679cbdf1050689ac573b3424ce
font_01_sfnt_off00010b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 11384 bytes
SHA-256: 22e7ab6e998812de0dc4874c99c36842f5e7793ee7c57ed1ec26e68d8ffed093
font_02_sfnt_off000131a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A5 16100 bytes
SHA-256: b59afbb2f683942213df284fd86cd9422ada0c5f1ffac7698db8c94a40390bc4

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