Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afb2c3973a2a64b…

MALICIOUS

PDF

80.9 KB Created: 2021-03-14 18:31:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f538084f737e8a566882c86a8039f50a SHA-1: 4bf3812308b322862e4609b275e64258968423df SHA-256: 9afb2c3973a2a64be7f1574db62cd21d11fc6efde6617fb51bda6fa44372bea9
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to disposable hosting or known malicious redirectors, suggesting a link farm or phishing lure. The primary malicious URL identified is 'https://crophysi.ru/award?keyword=gujarati+kakko+barakhadi+english+pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=gujarati+kakko+barakhadi+english+pdf In PDF document text
    • http://specrazreshenie.com/2556108120y6csy.pdfIn PDF document text
    • http://myyshooop224.site/acupressure_points_in_kannada3u36m.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/tsc_maternity_leave_form.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/kiwedufewuvag.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/periodic_table_black_and_white_a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://77a48bbd-706a-45f8-a225-ac1cc02029d7.filesusr.com/ugd/3be48b_de60d7c4e3d041458906971e2f959bc2.pdf?index=trueIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_32645541f8454cbcb4fb4d96e357c381.pdf?index=trueIn PDF document text
    • http://xomutojekes.myartsonline.com/pablo_neruda_famous_poems_in_english.pdfIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_b36d6702845d4b50b7fbd9039841bc4d.pdf?index=trueIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_5a2f2a3b18bd448e9ebc28d08c0e1d3b.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_ab4d2db1379a4705b711e9a83742861b.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_1f8416c77b614b65ba5feae02c098d89.pdf?index=trueIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_01aa4c1ae1f041bba1c6004ce8bdd382.pdf?index=trueIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_fb0a6c33e3ea4011b7cb1ed28db91584.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af61315-0716-443f-9a40-500a9c01af00/80277316829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/409e5197-4c5a-49d4-b915-aee892739ae8/the_emerald_tablets_of_thoth_download.pdfIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_9999e8e51a25454e8856fdf0dde519b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/60003c7e-5241-42b6-a4ac-1bbece86f03d/libro_de_lecturas_primer_grado.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 5616 bytes
SHA-256: 061c19579dfba52bf11dd5e939e2074a79895a519b48cf22474599c462a70f98
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 4612 bytes
SHA-256: 4b917f6706d328417ad62478f6e85b475e18de7811f1be2a7e8866824d17f47c
font_02_sfnt_off00010184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10184 12460 bytes
SHA-256: 7dfc3c7bd826681d1b445e1f595a2b57e1b454424918f69134725581bbae7025
font_03_sfnt_off00012822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12822 3384 bytes
SHA-256: 31c937e223f18ad47990e1105881a1bad99b4ec44f8eb7bf73f67a54efe0182a

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