Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0c5aacfa3e87ff…

MALICIOUS

PDF

80.7 KB Created: 2021-04-07 00:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 364d5238f8801ff54a6ffe78b8b9486b SHA-1: 8f79e04356e5b8983b38d14ee6321f7c01d448f6 SHA-256: da0c5aacfa3e87ffe3e8557f29c66bd4036e60d192a080cb0227449f7e082b5a
186 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 0.9997

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 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.
  • 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.
  • 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/strik?utm_term=canon+in+d+piano+sheet+music+advanced+free+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369648/normal_5fd8fbc8babef.pdfIn PDF document text
    • https://cdn.sqhk.co/xamozafi/hfhaieo/xiaoyi_yi_mini_dash_camera_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377109/normal_5fe274c5ed93e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384325/normal_5fc62ef9b1195.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/Kghvghx/71971541403.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_085e77c157354a118d89046e79d03bf8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/98077686-7488-4c0e-ad21-2867c42cf877/sundance_spa_manual_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/871bc888-8643-4960-a556-be67b6114028/who_moved_my_cheese_summary_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/86631873167.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_23a6f5d99a894453909bbb52c72d4ddb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/nivabevijen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb515f37-0e75-41eb-96cf-fe8923d2cd6f/88480058859.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/why_wont_my_milwaukee_radio_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c129be-efe8-4d5f-99f8-22d1d47384ef/cub_scout_cyber_chip_bears.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90c325d2-388a-4388-89dc-2eede9a94170/how_old_is_zens_brother_from_snow_white_with_the_red_hair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d879afb5-caf0-47e7-9a52-103602134a44/aguda_llana_o_esdrjula.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/how_do_i_write_up_a_rental_agreement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/689abe3f-9501-4d41-ae21-ce0757fb394b/kubasolosuwefuruwoka.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/17326845212.pdfIn PDF document text
    • https://67acb2b6-3e42-4063-a073-371cb527a15d.filesusr.com/ugd/a81d48_d994838ffc4b4244945bf466e40de7f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a8b0dc0-c8cf-4240-b502-11bfe941650b/what_foods_help_get_clear_skin.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_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 5328 bytes
SHA-256: eac5c381f0b211bb64f263149a07ac8dbf4bf1a1443be58e7e2e2d8266186c3e
font_01_sfnt_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 12476 bytes
SHA-256: 8f1bb77a6235b6fa2492427d402ffcdec5127b57a4c8c648c0d2769d40a56be6