Malicious PDF — malware analysis report

Static analysis result for SHA-256 a403b048338b0720…

MALICIOUS

PDF

101.8 KB Created: 2021-04-06 19:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 42d935645d35d762d551538d27f866c7 SHA-1: 9cde1854e2b5e24f3b1351a59252e73890238501 SHA-256: a403b048338b0720b156396d857d452b006553b559dcdaf502588ff096e56b24
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 0.9985

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
  • 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://jottigo.ru/aws?utm_term=can+you+take+permit+test+online+ma PDF link annotation
    • http://kepuxom.mypressonline.com/xubedoxuzafizirigebi.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/j6gg13W/dabazitawepejijakageb.pdfIn PDF document text
    • https://xavimunemu.weebly.com/uploads/1/3/2/8/132815343/giweso_kabewavuxuwup_pepejusog_vabupega.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/hgehdha/34089880741.pdfIn PDF document text
    • https://wubedalenab.weebly.com/uploads/1/3/1/3/131383767/5085086.pdfIn PDF document text
    • https://jizirazizeki.weebly.com/uploads/1/3/4/5/134509590/zezip.pdfIn PDF document text
    • https://beperupofifu.weebly.com/uploads/1/3/1/6/131636755/7008473.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/seventh_day_adventist_bible_commentary_vol_6.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/ozHgfEu/dilated_pore_of_winer_dr_pimple_popper.pdfIn PDF document text
    • https://jigupeditu.weebly.com/uploads/1/3/1/3/131380623/kutofakuzadilifemusu.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/farmall_super_a_carburetor_flooding.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/5dbe0744-cd99-482b-984b-f07379ea0abf/fonofigaminovozutisukupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/715c8588-ed7c-42cf-ad1b-9b270def474e/glory_in_death_summary.pdfIn PDF document text
    • http://ruzofugeru.myartsonline.com/employee_recommendation_letter_sample_from_employer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e26f950b-b56a-4a26-ad1c-4d39811c10f2/peavey_bandit_112_review_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/how_to_successfully_stop_smoking.pdfIn PDF document text
    • http://wokidomogu.onlinewebshop.net/causes_of_microcytic_hypochromic_anemia.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/info._applicate._airport_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/zozuzeluwuvudawuwabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/654c948a-c882-435b-88f1-dadcd2cc5219/69683100553.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/50077941600.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/champion_energy_report_power_outage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86fe4ef-f66d-4e3e-a3d0-539bf93aa53f/excel_2013_odbc_driver_download_32_bit.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_off00015091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15091 5036 bytes
SHA-256: 0c308ddf02657bbafb18c52f9ff803a1a9868fde0eafe11d293c0639a4bf6a15
font_01_sfnt_off000161a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161A5 11140 bytes
SHA-256: 9dc66ca526d9f692b13e6f8a776248f9ff2787bcf0e1b77cd2f367dde708ce3a