Malicious PDF — malware analysis report

Static analysis result for SHA-256 635d0cd50b467b04…

MALICIOUS

PDF

77.4 KB Created: 2021-03-18 07:00:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: f8584d1b0bdba3e8ce640b4843eb5c6e SHA-1: 4480ad0d37da466f7e799ee63a9ac0b77d447ecc SHA-256: 635d0cd50b467b04666db5d31776ace073562ad31401b73ac70b8e482685756f
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'Prima de riesgo de trabajo pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/123?utm_term=prima+de+riesgo+de+trabajo+pdf PDF link annotation
    • https://vopilexazum.weebly.com/uploads/1/3/2/7/132740267/raxipemamidikox_dexidedeninuro_jobumuroselefus.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415951/normal_5ffd281d1529c.pdfIn PDF document text
    • https://fujazilumekopel.weebly.com/uploads/1/3/2/6/132681311/tukonu_bibodob.pdfIn PDF document text
    • https://divojalu.weebly.com/uploads/1/3/4/6/134664609/2071178.pdfIn PDF document text
    • http://jakebaxujimug.22web.org/abstract_painting_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408866/normal_6045f7a6c9f78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447431/normal_6023ff2bd160b.pdfIn PDF document text
    • https://jugovufepejeja.weebly.com/uploads/1/3/4/6/134611134/dobox-xomapirojedod-gemoxeresiwapi-nukipedopum.pdfIn PDF document text
    • https://xelegiri.weebly.com/uploads/1/3/4/4/134435730/4702075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452862/normal_5fda70ad1f565.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumilamufitilu.epizy.com/lajojunowoturobikeni.pdfIn PDF document text
    • http://pejezal.rf.gd/c_i_d_video_hd.pdfIn PDF document text
    • http://gadoxijumulop.epizy.com/dissidia_y_shtola_guide.pdfIn PDF document text
    • http://lenisemi.epizy.com/bhilwara_milgi_video_song.pdfIn PDF document text
    • http://nerusejide.rf.gd/plural_form_of_basis.pdfIn PDF document text
    • http://wunekoxewufomaf.epizy.com/liwomufokajopulolevosa.pdfIn PDF document text
    • http://fezuveguxala.epizy.com/52969602637.pdfIn PDF document text
    • http://zezatavaveb.epizy.com/football_manager_handheld_2015_apk__data.pdfIn PDF document text
    • http://degefoxovovi.epizy.com/falolebebilodivomuvururu.pdfIn PDF document text
    • http://puzekubaxi.epizy.com/how_to_use_a_craftsman_6_gallon_air_compressor.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_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 5548 bytes
SHA-256: 2c991b46526685ab1ba1d8690673014038cd8a2ca2dbe6514d2af2217328cb37
font_01_sfnt_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 11604 bytes
SHA-256: 3de2c64a9cfb04bf084a142af95b5e80f85a64bc9dd2b35bf05147a72b05940d

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