Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4fb2f085c4dcbc9…

MALICIOUS

PDF

96.7 KB Created: 2021-03-18 06:19:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6018c7246c327687d0ec38d9ac09f9ef SHA-1: 20e7b06ef54225e54cce687604cb06ed4f518a34 SHA-256: a4fb2f085c4dcbc93f9d8ac58487f666c3bc271310ea3495482fe2a6a3006038
126 Risk Score

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 0.9992

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://druttle.ru/award?keyword=belt+and+road+comic+pdf PDF link annotation
    • http://rijigikesezaga.mypressonline.com/46821430451.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/wastewater_treatment_plant_construction.pdfIn PDF document text
    • http://shoes-storie.club/fapuzer36sx5.pdfIn PDF document text
    • http://kinoxca.xyz/77714546635g6pkh.pdfIn PDF document text
    • http://auto-agents.space/novels_by_iqra_sagheer_ahmedvx40p.pdfIn PDF document text
    • http://kirudikegopoded.sportsontheweb.net/tavexesijina.pdfIn PDF document text
    • http://zarabatyivat.ru/pioneer_avh-p2300dvd_wiring_harness_diagram83193.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/luriburikadomul4s8z.pdfIn PDF document text
    • http://tersq.space/wisc_v_range_descriptors4mw80.pdfIn PDF document text
    • http://memisada.mygamesonline.org/osmolarity_potato_lab_report.pdfIn PDF document text
    • http://liketime.online/waxumojijuwodg18xo.pdfIn PDF document text
    • http://policyhelpcenter.com/how_to_connect_wireless_headphones_to_yamaha_receiverggbh0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://c8f6a2ed-bc8a-4fd4-b26a-19707db7c4cd.filesusr.com/ugd/1cc7e8_9bdd8f1d73f14601a08663b382415473.pdf?index=trueIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_c2e2113370f544b6921c5ece15e172f2.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_0e637b6a6fe3458db11fe3dc8ad9de45.pdf?index=trueIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_ff0018143abc451c92c2a498a65105e1.pdf?index=trueIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_891b18f06f99415fb8ba16880740707b.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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn 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_off00010923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 2988 bytes
SHA-256: f5ddbcf5b609e13701cb72e40b65c4fcce4f49cdb24c9397deb5622f67bbbc53
font_01_sfnt_off000113c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 5172 bytes
SHA-256: 76f563cf31ad25fdc9d3f2e90bb4ffc0459bd175dfb4474ca5acf51290bb3824
font_02_sfnt_off0001253b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253B 6884 bytes
SHA-256: c58ce37de60d36f531647f40506030a2db0e34301c26aca557b421ec74ea1a9e
font_03_sfnt_off000137a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A2 11580 bytes
SHA-256: ad9fd71833cd0064873c45aeee31ff98a9236acc4127e5fc4e63341d6dfff5df
font_04_sfnt_off00015f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F60 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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