Malicious PDF — malware analysis report

Static analysis result for SHA-256 168601f7453a019f…

MALICIOUS

PDF

75.3 KB Created: 2021-03-05 10:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dbda7eb2914e2cd588429377ac1b3029 SHA-1: 26c6815bbe72045f14a68425a4c35a08d0f4a957 SHA-256: 168601f7453a019f8de7b0afd3d4fa97807a7452871c9b80246ca3ff1393c75e
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic confirm the attack pattern of luring users to malicious sites.

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
  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dafemum.ru/strik?utm_term=cuisinart+juicer+cje+500+reviews In PDF document text
    • http://1cats.space/new_movies_2019_app_tamilv3sws.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/jjw1Lhc/15044685343.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/iHbFgjb/dikekijukuxalelif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481164/normal_5fc67dc878ad0.pdfIn PDF document text
    • http://kodesurajevo.iblogger.org/can_physical_therapist_help_scoliosis.pdfIn PDF document text
    • http://setovewurepenu.22web.org/yoga_mat_thickness_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417807/normal_6029440bc78d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475874/normal_603ce7e75659c.pdfIn PDF document text
    • http://govnososal.xyz/rarakifapovefokuzadadatevkr0ls.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369493/normal_6033a93c1f7e7.pdfIn PDF document text
    • http://datinge.site/55404776659n777.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/hNG07Tq/27545143696.pdfIn PDF document text
    • https://kimubewej.weebly.com/uploads/1/3/5/3/135329621/betarowajojifasipan.pdfIn PDF document text
    • http://xasujaru.22web.org/calendar_2021_excel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_603882939bb8a.pdfIn PDF document text
    • https://kiburosipaso.weebly.com/uploads/1/3/4/6/134601321/tebev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molopafefo.rf.gd/factorising_quadratics_questions_and_answers_gcse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff1bcc10-7131-4d11-a8da-133ece96ed89/47300352429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/489547f4-9e85-4a48-a5bc-c3a10a094ed0/can_a_vitamix_make_smoothies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc8ae6c-07fd-48fa-a7c2-e91808295796/libro_de_los_sueos_samael_aun_weor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a1ab40-abde-42bf-967d-2c291f413bef/58580221868.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_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 5160 bytes
SHA-256: 1620ff471f9b6cf4b0ae2af155b06e7279f4c836760787d7ec8dc4597d9edbbb
font_01_sfnt_off0000fa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 11220 bytes
SHA-256: 5b71a7ff4d441b58f2d568148220c23f64a0dc57cd4c6f180c2c4f37dcc9a2d9