Malicious PDF — malware analysis report

Static analysis result for SHA-256 654fbc67c330cec1…

MALICIOUS

PDF

80.3 KB Created: 2021-03-25 03:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b640a997278734f6c361ad3f9b300ef9 SHA-1: 9f1b860a5d5d80eef27806341c41676f557385a9 SHA-256: 654fbc67c330cec19c6992bb7a818fa447bef97ac9764c47cc5e19ce817cc024
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to contain keywords related to classified ads, which is likely a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://dugedepap.ru/123?utm_term=anuncios+clasificados+periodico+reforma+mexico PDF link annotation
    • https://bibawegosisuzu.weebly.com/uploads/1/3/5/9/135961680/3bb1e6ff8357cec.pdfIn PDF document text
    • https://xodebizig.weebly.com/uploads/1/3/2/6/132681497/7555930.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/lonorobebigi.pdfIn PDF document text
    • https://xikodixugab.weebly.com/uploads/1/3/4/7/134707070/taperozabe.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/singer_prelude_threading.pdfIn PDF document text
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/madexesifi_lezapopesimim.pdfIn PDF document text
    • http://worabipupe.mypressonline.com/89055568367.pdfIn PDF document text
    • http://duwosolutanuz.mypressonline.com/ccna_switching_practice_labs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_989110bf6b4d4a2abf9022a2da64b479.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/verb_ing_or_infinitive_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f44f85e8-7458-4598-b926-1b6f68a53309/how_to_cut_triangles_for_a_quilt.pdfIn PDF document text
    • http://sasaxunofob.atwebpages.com/descargar_abecedario_chino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a84092e-9bc7-4f0c-99c5-7e7b56ba9651/rowoxusef.pdfIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_05d61d9ccbb445bc99681e9c9f7a2431.pdf?index=trueIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_b9b811b21c1a46b9b4665b51da907eff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farezelof/68067578146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96a02181-b944-4e34-bd65-51c83b786a49/222141080.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/sony_icf-c1_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/745c7c40-54a5-4f7a-81b8-84867929eac8/how_many_calories_in_a_whole_grain_bagel.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_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 5360 bytes
SHA-256: bdd4e483e18e73bfa108b9ec158506ed4f81d896b247ac02672d9aa4e9b5088c
font_01_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 12612 bytes
SHA-256: c2290526d716094e1f695262a7f2661cc3e1451f9b8bf4a9e3d064cd4fd9fb67

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