Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37a4d4f831f741c…

MALICIOUS

PDF

74.4 KB Created: 2021-03-23 15:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 964feaf4385abda5759fda86e8d58abd SHA-1: 17d7add53432984849609315e8a08a68948114c7 SHA-256: a37a4d4f831f741c181eca484f755842871da3461646c4e26a93e2261ba10d45
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=why+is+my+brother+printer+printing+blank+pages PDF link annotation
    • http://jakesubinosol.scienceontheweb.net/dapazafuwutuxetob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_603bf16829e8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450426/normal_604b71da7f48e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483361/normal_6002140b2f5fb.pdfIn PDF document text
    • http://gifawel.22web.org/mafabedobenopudatoveme.pdfIn PDF document text
    • http://vafakewa.iblogger.org/cd_siz_format_atma_windows_8.pdfIn PDF document text
    • http://ninijefaligogi.mygamesonline.org/34885482951.pdfIn PDF document text
    • http://mubositesene.mypressonline.com/introduccion_a_las_energias_renovables.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382201/normal_6018453694247.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dupula/ctet_2019_application_form_last_date.pdfIn PDF document text
    • http://dajejat.rf.gd/fimasatepapaxubefagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4dc6cc2-677b-4e7a-aa62-c0ffe7d34e58/allen_ginsberg_howl_poem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d06307-e9f0-4899-ab9b-49258d168b6f/programa_de_honores_a_la_bandera_12_de_octubre.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/velipagubelizowodum.pdfIn PDF document text
    • http://vodipofasofuf.rf.gd/novekedodopet.pdfIn PDF document text
    • http://butomepa.rf.gd/55767777188.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b147cd-b3a8-4d4e-801c-7ba5706ac209/kowitofodapetinik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e23243ee-06e6-49d8-a52f-9c29cbd7c706/jorge_luis_borges_historia_universal_de_la_infamia.pdfIn PDF document text
    • http://mimafesajasi.rf.gd/gogajigix.pdfIn PDF document text
    • http://zasagugidi.epizy.com/ravetixudowovojomobenom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/231597b5-abd8-4f9f-9c94-bf14cc884443/lugefuzulubonudujuzigoj.pdfIn PDF document text
    • http://ratimoli.epizy.com/de_novo_synthesis_of_fatty_acids_palmitic_acid.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_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 5552 bytes
SHA-256: ad1bbc2d870d8c2297ac99c37c607bf73287d00f3d9b863c57f734ac28aac1cf
font_01_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 10768 bytes
SHA-256: 2109e85588967cfc8adb6b51015ff0724668c9dbe246ca78008aae450ae00fff

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