Malicious PDF — malware analysis report

Static analysis result for SHA-256 f243b64b4f367dd1…

MALICIOUS

PDF

75.7 KB Created: 2021-03-29 01:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d1479ced2f54bb7f5448edf512e6182f SHA-1: 5e6a98f364e35e5d3668de611ad27037b41ca56f SHA-256: f243b64b4f367dd1d67f45281bcf2069fbf548a39155b21f1c3e7a11732ee367
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 0.9993

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://kuzutuzo.ru/123?utm_term=baby+funny+video+status PDF link annotation
    • https://lejimawemo.weebly.com/uploads/1/3/0/7/130739028/vifalebi-luwezus-getujejonuzopes-kanidukigiwi.pdfIn PDF document text
    • http://gukevipagopu.mywebcommunity.org/tanurigaweli.pdfIn PDF document text
    • http://agentsecure.space/make_out_definition_yahoo_answersin39r.pdfIn PDF document text
    • http://xogavuw.medianewsonline.com/rakuva.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/6929915.pdfIn PDF document text
    • https://burakizu.weebly.com/uploads/1/3/1/0/131070688/f2ae82352ebeaf5.pdfIn PDF document text
    • https://pudisipilusive.weebly.com/uploads/1/3/4/5/134597375/91484c64e1.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/58447570581wsipf.pdfIn PDF document text
    • http://mazejofeg.mygamesonline.org/el_absolutismo_en_europa.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/84604bc1-6d6f-4ede-8824-eb7045d6da38/fuwexowigalagepivobeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c790907b-440e-41aa-b562-eb39d822cc98/81473634765.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/88219025601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/005a3ca4-19f2-4314-ab76-051cd293be13/why_do_i_love_being_the_center_of_attention.pdfIn PDF document text
    • http://gumomexad.onlinewebshop.net/gogedumunizunodaled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d213333-bcee-481a-b9ad-c3289e9653e5/shark_200_meter_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/murudofukagapo.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/medicinal_plants_information_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8451440-a3f9-43e1-8fbf-0106e533bf3a/can_you_watch_your_xfinity_dvr_recordings_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/building_materials_and_construction_practices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0cd9a2e-e443-467c-a55c-4ada1fad628e/will_a_universal_remote_work_on_a_converter_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dd09c53-111e-47b2-92f4-cc1a78d9ad80/rajilurapid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71494414-5ef6-4bc5-b880-8983c7353ae5/wezegade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d3d0da-80cf-45a5-b042-fc8c1bee3df7/lesson_7.2_skills_practice_answers_algebra_2.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_off0000ec70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC70 5124 bytes
SHA-256: b2ab136d82307d70d10db174df81a1ab77fa0ce924c1c1cce170922e24d34238
font_01_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 10448 bytes
SHA-256: 85f7d636e118a84296fe128e2ef5b466eb7791dfaea094b3bfe3322f1a6af71b