Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a6ae4a598459ed…

MALICIOUS

PDF

109.2 KB Created: 2021-03-08 13:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1f6dd6d1041419f7c150ddb9afd60838 SHA-1: 9ce78bead3c539d031a376c168daef0a4a705982 SHA-256: b9a6ae4a598459eda802bb6d4c45c72036d5523170da2ae9fc6102b752cb01fb
246 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document may also attempt to solicit sensitive information. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://lozipotod.ru/award?keyword=cracking+the+coding+interview+github+pdf PDF link annotation
    • https://cdn.sqhk.co/xuzizadupu/9byjdmF/bugmenot_consumer_reports.pdfIn PDF document text
    • https://fazijexin.weebly.com/uploads/1/3/2/7/132741066/8562f12693.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/why_does_god_let_me_be_lonely.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/00303c0.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/ghaAjhC/ice_cream_cone_drawing_3_scoops.pdfIn PDF document text
    • http://sifimomikev.sportsontheweb.net/67126468239.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/hi61ijJ/heli_100_level_40.pdfIn PDF document text
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/gukobebu-kirupafoliw-tejina.pdfIn PDF document text
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/6168691.pdfIn PDF document text
    • https://bonagimeduvutup.weebly.com/uploads/1/3/1/4/131453121/5638812.pdfIn PDF document text
    • https://cdn.sqhk.co/dimumaneda/Zihic2n/84802673378.pdfIn PDF document text
    • https://pefesasorib.weebly.com/uploads/1/3/5/9/135972127/ccccb141aba1ebe.pdfIn PDF document text
    • https://mepaxekedin.weebly.com/uploads/1/3/4/5/134514716/gibizulura.pdfIn PDF document text
    • https://sazeduxawi.weebly.com/uploads/1/3/2/6/132695343/78879bc3bd9d.pdfIn PDF document text
    • https://menusopam.weebly.com/uploads/1/3/4/5/134597334/sorodesozakexe_gelenebe_bezuwunaxiveno_xejipidav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zijedan.atwebpages.com/jumpstart_to_skinny.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/xemidigekazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c95d038-ce30-4304-b1c2-8329d1912e69/maytag_bravos_xl_mvwb835dw2_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25f0f37f-841b-46cb-ba13-e94810e4618e/is_ge_cafe_worth_the_money.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/can_t_wait_synonym_formal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5acb047a-16aa-4c27-830a-34fd00055836/ver_un_puente_hacia_terabithia_en_castellano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9c17c10-45c6-4ac1-92fb-adbca8b4cf84/25069355378.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/2927980270.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/du_llb_entrance_2018_answer_key.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_off0001707a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1707A 5468 bytes
SHA-256: 4ccc6fa97eb70b0a6940df38db8eb89cfedd8cdc83ddcf77d9e50525ca71d74e
font_01_sfnt_off0001831f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1831F 10640 bytes
SHA-256: cc5d6b1eaa2653680b2e5ac1ea2f3b1cd611f1319f3e546561cc69a4f604258c