Malicious PDF — malware analysis report

Static analysis result for SHA-256 6909322bad5ee49e…

MALICIOUS

PDF

81.0 KB Created: 2021-04-28 15:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: bdf9d26d8c2c869fe2c294c21116e818 SHA-1: d72b89cc43138e9e98905b321e052b6534b566b4 SHA-256: 6909322bad5ee49e69fe7b576580b308cf036a702e099be26283b1b5cfa7a29e
224 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains embedded links, one of which points to a known malicious redirector. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document likely instructs the user to open a password-protected archive, a common tactic to evade gateway scanning. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://yafferge.ru/strik?utm_term=black%2527s+law+dictionary+4th+edition+pdf+free+download In PDF document text
    • http://ogranicbio.fun/3237924443zbaq9.pdfIn PDF document text
    • http://okrasote.info/60628721109vsk0.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/snake_plant_light_and_waterfyq02.pdfIn PDF document text
    • http://parkingtest.xyz/the_monkey_app_download_ioss7e03.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/48ef2d08-6214-4647-9b6c-1adcd0aaef47/ielts_academic_writing_sample_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/16530924130.pdfIn PDF document text
    • http://robeguf.epizy.com/aplicativos_para_ler_livros_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4548e0-5167-4252-b6b5-1c448dbaf14b/1608755899.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/6453154072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb6ae947-6985-4301-bdb9-b65bbe9a79a3/44559799004.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/thanksgiving_algebra_worksheets_high_school.pdfIn PDF document text
    • http://kixixiwibatogit.epizy.com/rijelelezapopatiwekelekam.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/inventions_and_inventors_unit_3_worksheet_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3961d18-3718-48de-be67-20f1c4704ef3/23200988706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25970fd4-56b2-4c69-a477-6a46abbf6fe9/sharp_objects_end_credits_song.pdfIn PDF document text
    • http://vedujekobizu.rf.gd/anamika_academy_english_grammar.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/mopabumox.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/39213649035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e424b3ec-c697-4001-b465-232ad6075b88/what_is_curriculum_and_instruction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c5e9297-a77d-4d83-9faf-fa815a0902ba/jenn_air_oven_repair_manual.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_off0000f582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF582 5672 bytes
SHA-256: d2dee66450d9b7ad7278f47666455b324572ec7f7cd7c04aa97863bc33ff6ccf
font_01_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 14060 bytes
SHA-256: 1c36088aafd0c34ce5ff97eb069dfac72b85d6f2c04258b988ee9a4df3ffb806

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