Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa8c5ec0a14d4fc…

MALICIOUS

PDF

90.9 KB Created: 2021-03-13 16:29:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4feb50b463ae2447305dc8e7fd46343c SHA-1: 9f061c2f881574be2021d6da32291f72478c7f1b SHA-256: 8aa8c5ec0a14d4fc9493649d035b500087c628a7a22c709613ed3b54a35bdb39
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 0.9952

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://mezovuduw.ru/wix?keyword=moto+x3m+3+unblocked+games+76 PDF link annotation
    • https://ziloxewimufe.weebly.com/uploads/1/3/0/8/130813797/06e958273117ee.pdfIn PDF document text
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/5798566.pdfIn PDF document text
    • https://gixovazaviv.weebly.com/uploads/1/3/5/9/135982549/9bebb.pdfIn PDF document text
    • https://bipuwuvi.weebly.com/uploads/1/3/0/7/130776795/6916375.pdfIn PDF document text
    • https://fojakodi.weebly.com/uploads/1/3/1/3/131379163/fivuvuvasat.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/piradi/90933120557.pdfIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_3af951107a524ef291e2bfb8a9949661.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_5ca0248e4ef2420e946bf12be73450e2.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_99b844cb41dc42719152f664bf43adae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/vijebewamato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/879af19e-2a85-4986-a713-1b7d256f55e1/stop_strategy_for_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3018868f-ccfb-4072-a453-8614abfdefde/1456953685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ca632b7-dc89-4220-952a-0a5f28c95f7d/65673046158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b030f7fa-7b29-4c18-8297-22785af786e2/17220139121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d101d5f9-6b90-4923-b642-7dbf4cc3ac2c/second_order_differential_equation_application_example.pdfIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_5f625e87aac245c4a6032fffb5fcf95c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zupenafud/top_5_personal_assistant_apps_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f690e456-6762-4f07-a25a-37a100e1a4cc/how_to_show_different_data_labels_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/487fe1a2-114c-4b66-9536-778e002b501f/define_alchemy_spirituality.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0faaa614-24ea-4c1e-a36b-b6f1cdec358a/desbloquear_telefono_grandstream_gxp1405.pdfIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_a2df80cc37864dfeba3f527f02eb8f4e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/whatsapp_messenger_java_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afdb42f5-d1fe-4d22-8934-41793b053259/does_netflix_have_maze_runner_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a923f876-324c-4eb1-974c-052eca8a8276/rovuzetujanute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eace718e-a344-4b3e-9702-383fe14c3212/ruxutezudivekofoliv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d3c179-3f56-4c87-af25-b6e7fb654d8f/44853279990.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_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 5836 bytes
SHA-256: c88bcd0a0fd0690a9ffd00c6d8d1203061b0537854695b00233d41aaa292ccde
font_01_sfnt_off0001219e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219E 11652 bytes
SHA-256: a2f794d73806627d931c536fefa95b2fcf10a37404b111cf318b80b410156b6d
font_02_sfnt_off00014890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14890 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f