Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cbb8de7cffefd88…

MALICIOUS

PDF

81.2 KB Created: 2021-03-12 18:51:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cbe03de1ea8d97ad6d1d4c30520ad886 SHA-1: d89d262f998550b3717c06e89f6e2a0110ddef50 SHA-256: 5cbb8de7cffefd88a1470821cf1bf804a75b5d15361157a157ecab30ab8f554d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least two pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged as a link farm on disposable hosting, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/123?utm_term=bisbee+az+restaurant+guide PDF link annotation
    • http://sawemawe.mywebcommunity.org/bruce_lee_fighting_method_vol_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452199/normal_602e3faae9fc9.pdfIn PDF document text
    • http://menazubuta.iblogger.org/cara_mengambil_bandwith_wifi_android.pdfIn PDF document text
    • http://varuzajuv.22web.org/pudowikitunuvimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483359/normal_5fd281cc6a090.pdfIn PDF document text
    • http://takotonefajale.22web.org/office_assistant_job_description_template.pdfIn PDF document text
    • http://xuforaxi.22web.org/corrugated_metal_sheets_dimensions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_26bbdde482154cc2ad18e934ad641e9d.pdf?index=trueIn PDF document text
    • http://rakemexovujepez.epizy.com/performance_validity_testing_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45d77f4c-0dd0-438e-a1b7-0713fd8b2c39/what_is_a_jump_discontinuity.pdfIn PDF document text
    • http://gofirog.epizy.com/pevejifegizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57e5b7b-b2a5-409d-9a63-29cf4a39edc4/the_study_of_human_geography_section_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba50ae9-55c1-4c1c-bfef-38703515c88e/kowajoraxedenusaleluj.pdfIn PDF document text
    • http://pepuzigupa.epizy.com/harrisons_manual_of_medicine_20th.pdfIn PDF document text
    • https://006b50d4-ad2a-4261-8279-34542eb0d7b0.filesusr.com/ugd/a640e9_92b93c446c444cc3abaab64fab17c781.pdf?index=trueIn PDF document text
    • http://selifesupenikiv.epizy.com/bollywood_mobile_movies_free_2019.pdfIn PDF document text
    • http://pazatitapogobij.rf.gd/what_does_the_ending_of_the_film_us_mean.pdfIn PDF document text
    • http://gixejemazob.myartsonline.com/implicaciones_de_las_inteligencias_multiples_en_la_educacion.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_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 5200 bytes
SHA-256: 258aad3c8386957e738160b7d3a70bf9abe18387b8bc3a32a28b6617bedfd13d
font_01_sfnt_off00011076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11076 11396 bytes
SHA-256: 6713c13cbcdcc96e1cfaed75185150eb24b8f1407cf01a354c882c740f8c5051

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