Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb7fc077dbb37ba…

MALICIOUS

PDF

78.7 KB Created: 2021-01-28 18:16:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2f63841c336c04ca85743986da967a34 SHA-1: e5f40c83f18422d7fd0b1c24a17afc2dca98e1c5 SHA-256: 1cb7fc077dbb37bafd4a9ca70e2aa69c793ca3760a5a601180df72859d3f6c13
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links pointing to a known malicious redirector, which is part of a link farm hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure the user to malicious content.

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
  • 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.
  • 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://yafferge.ru/123?utm_term=lifestyler+2000+exercise+bike+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371272/normal_600a914714844.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/3435956.pdfIn PDF document text
    • http://jelabenix.22web.org/kannada_latest_love_feeling_songs_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473622/normal_5fefa9dcd2d9f.pdfIn PDF document text
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/jaxaruburi.pdfIn PDF document text
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/71553f90794694.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465386/normal_5feebe8869e2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450438/normal_5feeae815a445.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454677/normal_5fc6923860c03.pdfIn PDF document text
    • https://lubefapezixa.weebly.com/uploads/1/3/1/3/131398117/nukorijuxix.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/nigimul/problem_solving_analysis.pdfIn PDF document text
    • http://liruvumud.rf.gd/juzegikanoke.pdfIn PDF document text
    • http://nupopejif.epizy.com/formule_de_la_clairance_de_la_creatinine.pdfIn PDF document text
    • http://vulofuza.epizy.com/39288006737.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/nudefafirojujudovomuden.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/math_worksheets_for_4th_grade_equivalent_fractions.pdfIn PDF document text
    • http://talakukatutevib.epizy.com/career_quiz_for_students.pdfIn PDF document text
    • http://jabelakejirer.epizy.com/metavonipitetiweziredo.pdfIn PDF document text
    • http://fudewalazakukug.epizy.com/nintendo_ds_emulator_games_for_pc.pdfIn PDF document text
    • http://pamerugug.epizy.com/56844071473.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_off0000f4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 5616 bytes
SHA-256: cfd516373156076a63dcb70b122a13267ff9ba41fca71575feeb21419e674e0f
font_01_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 10868 bytes
SHA-256: 435ef9b5e5a3edbcd863134d497226a1de137462e4a7d0567d8844d9c5989cdc

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