Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f28351a9cd878f…

MALICIOUS

PDF

79.1 KB Created: 2021-03-22 16:00:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: f143097696164d669014b55a21e1bae6 SHA-1: 071bcac245515f35169ac9ae9761385ea5669c0d SHA-256: b1f28351a9cd878f77faa83c3591a515e2dd8e5e359cae104e853ceb815ee6ba
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, with at least two pointing to unknown or disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to a Dell laptop, which could be part of a lure.

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://vilenefex.ru/strik?utm_term=dell+e5400+laptop+weight PDF link annotation
    • http://movopifotet.22web.org/wigolej.pdfIn PDF document text
    • http://bibuwobu.22web.org/reading_comprehension_questions_and_answers.pdfIn PDF document text
    • http://jexemukanofefoj.iblogger.org/rijesunaliriviji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_664391063016408995d9a8aceb694cbd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/liguwubore/71422727835.pdfIn PDF document text
    • http://jofewizabo.rf.gd/54853986417.pdfIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_3263a37252804c1aad5b589eeb4817e6.pdf?index=trueIn PDF document text
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_534f17cf634d44fc92b53571dd52eb42.pdf?index=trueIn PDF document text
    • http://nisexugolozefa.rf.gd/bapoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a2be27-b188-4ae7-a397-42cbf40e54ef/princeton_university_campus_map.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/17374825667.pdfIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_56a671c789894e6c92981a1d84ad6b89.pdf?index=trueIn PDF document text
    • http://duzixojaxop.rf.gd/unoisetion_cavitation_machine_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/p_l_account_format_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6500525c-3cf1-4e03-99ce-adc2875006de/8141367322.pdfIn PDF document text
    • http://jusarim.epizy.com/tonogabakunubawuregagupe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d4b620-2713-4e25-8796-2b7f2a2b461b/sistema_endocrino_estructurales.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/arlington_ohio_weather_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/699ecf76-855b-4fcd-bba7-c9ad6b5c9ccf/how_to_view_google_search_history_on_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/93316129714.pdfIn PDF document text
    • http://sivakekixil.epizy.com/9761419946.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 3872 bytes
SHA-256: 805e6655a5c8f5e2942ed4d937a75c7942a649fe92fbe809a24ce4ac535adf16
font_01_sfnt_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 5252 bytes
SHA-256: ab4b4e2fb863bf48a0e76993f72d3ce4cc583411130ee863da8f82104e39e938
font_02_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 11588 bytes
SHA-256: 66b4b80bc4054374b23e972f8c7b201cbcfd26272765350ea56bf5616ebad8d3

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