Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52ddda4e1252b5f…

MALICIOUS

PDF

88.5 KB Created: 2021-05-03 18:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c99927ea7c4d2d14691e3d87265e449f SHA-1: b1358c392b587b3b351c3eff3a3986f61811956e SHA-256: c52ddda4e1252b5ff0f621e84ad26e18d7f44391a4f93bce6b9e016b3d83daf2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=integration+of+cos%2528x%255E2%2529dx PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455642/normal_606e8932b58c7.pdfIn PDF document text
    • https://cdn.sqhk.co/kafexobesa/5Nhchbi/41163234762.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373509/normal_60033c9e726da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_6047a2c52e3ca.pdfIn PDF document text
    • https://cdn.sqhk.co/pajubopolak/gjidcOI/pressure_washer_attachment_for_hose_pipe.pdfIn PDF document text
    • http://daxamel.mywebcommunity.org/zakafejaliguxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_601b1c734d386.pdfIn PDF document text
    • http://zibodotuf.mygamesonline.org/indonesia_visa_application_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_6023cfa0964cb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411219/normal_5ff41ba975366.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/zidedunulenigiramo.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/c60K9if/cr123a_rechargeable_batteries_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/jfJ6jat/loopnet_dallas_restaurant.pdfIn PDF document text
    • http://wopizup.mypressonline.com/ejercicios_categorias_gramaticales_bachillerato.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/dc7e1ff1-0113-4d77-b325-d4385b8835ec/72692166038.pdfIn PDF document text
    • https://9a86171b-24d8-4f43-8717-687e75280c8f.filesusr.com/ugd/6234e8_0e284541d67d45bfb01d649705c40591.pdf?index=trueIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_227f7f840c78436ca4c81505e352f203.pdf?index=trueIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_027f2c7097db4996a301a55c92b839a9.pdf?index=trueIn PDF document text
    • http://wazipegemezen.atwebpages.com/cancionero_chileno_para_guitarra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab30f379-0fab-4c1f-8810-9a0d39f34c98/tiger_rice_cooker_cooking_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0039f53e-8258-476e-a0c6-24bd00925876/harry_potter_6_film_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fef4401-06dc-44bd-9f01-ca192f6ed389/gazelle_edge_machine_walmart.pdfIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_df725d7b5751421eb7dbc9120a0fb255.pdf?index=trueIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA9 9584 bytes
SHA-256: 2c313af82f5274a3ba1455b1c8d134f37c9184b714f54c584a34d228708dba78
font_01_sfnt_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 3040 bytes
SHA-256: a20bb4f408d8f784ad73c3448e4c5f25c27999cb50838481ad122ee355a0e39f
font_02_sfnt_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 5500 bytes
SHA-256: 40aa9eae37b182c9c0509da82d82cdb28ddef72e9643b95a5f5c4a407b4c10e9
font_03_sfnt_off00011451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 12480 bytes
SHA-256: 2795fbdb43b4fd6e1c5f289d320e1c44fc192f6e05af2b97470ba1271775faf2
font_04_sfnt_off00013d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3A 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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