Malicious PDF — malware analysis report

Static analysis result for SHA-256 215b9e0442164278…

MALICIOUS

PDF

82.8 KB Created: 2021-05-27 10:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f7832dd2308ea9d508dda5d6aa85f3ae SHA-1: 676279265be96cf6d9ca2de971a867398dcd2938 SHA-256: 215b9e04421642788d5c87212291119437a1862ff3108f8dfafd4cedcbf5f733
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, identified as a link farm hosted on disposable domains, suggesting a phishing or redirection attempt. The embedded content, though heavily obfuscated, is identified by ML classifiers and ClamAV as malicious, specifically a phishing trojan. The presence of external URIs and the overall structure strongly indicate a malicious intent to lead users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=blood+test+report+for+pregnancy PDF link annotation
    • https://divebofa.weebly.com/uploads/1/3/4/6/134690115/lasuf-tudaworupifedoz.pdfIn PDF document text
    • https://dosupara.weebly.com/uploads/1/3/1/3/131380612/3009729.pdfIn PDF document text
    • https://gasodugolulo.weebly.com/uploads/1/3/4/3/134375537/6273348.pdfIn PDF document text
    • https://girisuwudogepo.weebly.com/uploads/1/3/0/7/130776006/gejef_woxituka.pdfIn PDF document text
    • https://luzafoku.weebly.com/uploads/1/3/0/8/130814295/gawowisev.pdfIn PDF document text
    • https://biduvokiket.weebly.com/uploads/1/3/4/3/134367510/nukevezesuxa_femijirizojape_geten.pdfIn PDF document text
    • https://tovimovu.weebly.com/uploads/1/3/0/9/130969206/8186434.pdfIn PDF document text
    • https://vunojomilubokub.weebly.com/uploads/1/3/0/7/130775688/bdeffc17064297b.pdfIn PDF document text
    • https://waniwuwaweduf.weebly.com/uploads/1/3/4/3/134348957/wokimenitopupex.pdfIn PDF document text
    • https://ginimowawogob.weebly.com/uploads/1/3/4/7/134753870/507d7c49ee484b2.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/62397eb4-c4b1-4cf3-8159-1741e2546f05/timex_expedition_scout_chronograph_strap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d5c225-f1e0-4c71-b193-e922fd102811/wahl_cordless_clippers_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90c3e779-4425-4d46-9d92-f5d77cd31f37/miraculous_ladybug_saison_3_episode_1_vf_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b39366-bf07-4a66-9ea1-0de0810de96c/c_language_reference_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75db37c3-4205-4d8c-b9a6-febc5be26d90/what_is_the_role_of_discipline_captain_in_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/518ee7b4-6bb1-4ca1-9435-2106250201e2/a_fair_days_pay_for_a_fair_days_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/103e9f02-5028-4553-bc0f-3802ad3a60ea/liste_calories_burger_king_mozzarella_sticks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f773989e-c002-45c1-bc1e-a22433c83748/how_to_simplify_algebraic_expressions_with_parentheses_and_exponents.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18cd90be-d10a-4946-a6b5-53ab68ff8438/classics_of_philosophy_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23201160-960b-467e-8e23-4d397b0a6043/how_to_align_table_of_contents_in_google_docs.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_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 5476 bytes
SHA-256: f127628a2b02ccf8557f9394c52b61b12beb990a3aef2c83019f58c6e56f4fdd
font_01_sfnt_off000116bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116BB 11852 bytes
SHA-256: 7ae066b9a214b05f287a6441cf0770914e0e5d7a342118a02c2ec33704b16167